Whenever Territorial Hammerskull attacks, tap target creature an opponent controls.

Creatures entering the battlefield don’t cause abilities to trigger.

Target creature gets +2/+2 until end of turn. If it’s a Vampire, it gains first strike until end of turn.

When Wakening Sun’s Avatar enters the battlefield, if you cast it from your hand, destroy all non-Dinosaur creatures.

Flying

As Arcane Adaptation enters the battlefield, choose a creature type.

Creatures you control are the chosen type in addition to their other types. The same is true for creature spells you control and creature cards you own that aren’t on the battlefield.

Counter target spell.

Draw two cards. Then discard a card unless you attacked this turn.

{2}{U}: Daring Saboteur can’t be blocked this turn.

Whenever Daring Saboteur deals combat damage to a player, you may draw a card. If you do, discard a card.

When Deadeye Quartermaster enters the battlefield, you may search your library for an Equipment or Vehicle card, reveal it, put it into your hand, then shuffle.

Whenever you cast a Merfolk spell, create a 1/1 blue Merfolk creature token with hexproof. (A creature with hexproof can’t be the target of spells or abilities your opponents control.)

Return target creature to its owner’s hand. Create a Treasure token. (It’s an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Target creature you control gets +0/+3 and gains hexproof until end of turn. (It can’t be the target of spells or abilities your opponents control.)

Flash

Flying

Dreamcaller Siren can block only creatures with flying.

When Dreamcaller Siren enters the battlefield, if you control another Pirate, tap up to two target nonland permanents.

Gain control of target creature with mana value X.

Creatures you control with flying get +1/+1.

Whenever Fleet Swallower attacks, target player mills half their library, rounded up.

Creatures you control with +1/+1 counters on them can’t be blocked.

+1: Whenever one or more creatures you control deal combat damage to a player this turn, draw a card, then discard a card.

−2: Create a 2/2 blue Illusion creature token with “When this creature becomes the target of a spell, sacrifice it.”

−5: Create two tokens that are copies of Jace, Cunning Castaway, except they’re not legendary.