Whenever a creature enters the battlefield under your control, you gain 1 life.

Whenever a creature enters the battlefield under your control, you gain life equal to its toughness.

Whenever a creature enters the battlefield under your control, you may have Angel’s Tomb become a 3/3 white Angel artifact creature with flying until end of turn.

Whenever a creature enters the battlefield under your control, you gain 1 life. If Answered Prayers isn’t a creature, it becomes a 3/3 Angel creature with flying in addition to its other types until end of turn.

Whenever a creature enters the battlefield under your control, you may destroy target artifact or enchantment.

Creatures your opponents control enter the battlefield tapped.

Whenever a creature enters the battlefield under an opponent’s control, you gain 1 life.

{T}, Sacrifice a creature: Blasting Station deals 1 damage to any target.

Whenever a creature enters the battlefield, you may untap Blasting Station.

Whenever a creature enters the battlefield under your control, it fights up to one target creature you don’t control with the same mana value.

{T}: Create a Treasure token. Activate only if you control a creature that fought this turn.

Whenever a creature enters the battlefield under your control, you gain 1 life.

To solve — You’ve gained 5 or more life this turn. (If unsolved, solve at the beginning of your end step.)

Solved — Sacrifice this Case: Creature cards in your graveyard gain “You may cast this card from your graveyard” until end of turn.

Whenever a creature enters the battlefield under your control, put a +1/+1 counter on each creature you control.

{TK}{TK} — When this permanent leaves the battlefield, draw a card.

{TK}{TK}{TK}{TK}{TK} — Whenever a creature enters the battlefield under your control, this permanent becomes a 13/13 Eldrazi creature in addition to its other types until end of turn.

{TK}{TK} — 4/2

{TK}{TK}{TK}{TK} — 5/6

Whenever a creature enters the battlefield under your control, you may look at the top X cards of your library, where X is that creature’s power. If you do, put one of those cards on top of your library and the rest on the bottom of your library in any order.

Whenever a creature enters the battlefield under your control, you get {E} (an energy counter).

{4}, {T}: Return target creature you control to its owner’s hand.

Whenever a creature enters the battlefield under your control, you may pay {1}. If you do, put a +1/+1 counter on that creature.

{5}{G}, Sacrifice Durable Handicraft: Put a +1/+1 counter on each creature you control.

{TK}{TK} — Whenever this creature attacks, untap target permanent.

{TK}{TK}{TK}{TK} — Whenever a creature enters the battlefield under your control, creatures you control get +1/+1 until end of turn.

{TK}{TK} — 2/3

{TK}{TK}{TK} — 5/3

{TK}{TK} — {2}: This creature gets +2/+0 until end of turn.

{TK}{TK}{TK}{TK} — Whenever a creature enters the battlefield under your control, this permanent deals 2 damage to target player.

{TK}{TK} — 4/1

{TK}{TK}{TK} — 3/6

+1: Put a loyalty counter on Huatli, Radiant Champion for each creature you control.

−1: Target creature gets +X/+X until end of turn, where X is the number of creatures you control.

−8: You get an emblem with “Whenever a creature enters the battlefield under your control, you may draw a card.”

Whenever a creature enters the battlefield under your control, if it has one or more oil counters on it, put an oil counter on it.

Creatures you control with oil counters on them get +1/+1.

If Leyline of Vitality is in your opening hand, you may begin the game with it on the battlefield.

Creatures you control get +0/+1.

Whenever a creature enters the battlefield under your control, you may gain 1 life.

Equipped creature gets +1/+1 for each charge counter on Mace of the Valiant and has vigilance.

Whenever a creature enters the battlefield under your control, put a charge counter on Mace of the Valiant.

Equip {3}

Flash (You may cast this spell any time you could cast an instant.)

Enchant creature

Whenever a creature enters the battlefield, enchanted creature gets +2/+2 until end of turn.

Whenever a creature enters the battlefield, if it was cast, exile it, then return all other permanent cards exiled with Mirror of Life Trapping to the battlefield under their owners’ control.

Enchant creature

Enchanted creature has “Whenever a creature enters the battlefield under your control, this creature gets +1/+1 until end of turn.”

When Nurturing Presence enters the battlefield, create a 1/1 white Spirit creature token with flying.

Whenever a creature enters the battlefield under your control, it explores. (Reveal the top card of your library. Put that card into your hand if it’s a land. Otherwise, put a +1/+1 counter on the creature, then put the card back or put it into your graveyard.)

Whenever a creature enters the battlefield, if there are two or more other creatures on the battlefield, exile that creature. Return that card to the battlefield under its owner’s control when Portcullis leaves the battlefield.

Enchant creature

Enchanted creature can’t attack or block, and its activated abilities can’t be activated.

Whenever a creature enters the battlefield under an opponent’s control, you may attach Prison Term to that creature.

Equipped creature gets +2/+1.

Whenever a creature enters the battlefield under your control, attach Ronin Warclub to that creature.

Equip {5} ({5}: Attach to target creature you control. Equip only as a sorcery.)

Equipped creature gets +1/+1.

Whenever a creature enters the battlefield under your control, you may attach Sai of the Shinobi to it.

Equip {2}

Whenever a creature enters the battlefield under your control, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Whenever you cast a spell that targets a creature you control, draw a card.

Vigilance

Whenever a creature enters the battlefield under your control, if its power is greater than Sharp-Eyed Rookie’s power or its toughness is greater than Sharp-Eyed Rookie’s toughness, put a +1/+1 counter on Sharp-Eyed Rookie and investigate. (Create a Clue token. It’s an artifact with “{2}, Sacrifice this artifact: Draw a card.”)

Enchant creature

Enchanted creature has indestructible.

Whenever a creature enters the battlefield, you may attach Shielded by Faith to that creature.

Whenever a creature enters the battlefield under your control, if that creature is 1/1, put two +1/+1 counters on it.

Equipped creature gets +1/+1.

Whenever a creature enters the battlefield under your control, you may attach Stormrider Rig to it.

Equip {2}

Whenever another creature enters the battlefield under your control, you may gain 1 life.

Whenever a creature enters the battlefield under an opponent’s control, you may have that player lose 1 life.

Whenever a creature enters the battlefield under your control, draw a card if its power is 3 or greater. Otherwise, put two +1/+1 counters on it.

Whenever a creature enters the battlefield under your control, creatures you control get +1/+1 until end of turn.

Whenever a creature enters the battlefield, if you cast it from your hand, you may search your library for a creature card with the same total power and toughness, put it onto the battlefield, then shuffle.