First strike, protection from white

Each other Warrior creature you control enters the battlefield with an additional +1/+1 counter on it.

Each creature you control with a +1/+1 counter on it has trample.

Each creature assigns combat damage equal to its toughness rather than its power.

Electrolyze deals 2 damage divided as you choose among one or two targets.

Draw a card.

Trample, haste

At the beginning of the end step, sacrifice Groundbreaker.

Other Elves you control get +1/+1.

{G}, {T}: Create a 1/1 green Elf Warrior creature token.

{T}: Add {C}.

{1}: Mutavault becomes a 2/2 creature with all creature types until end of turn. It’s still a land.

Flying

Whenever you draw a card, Niv-Mizzet, the Firemind deals 1 damage to any target.

{T}: Draw a card.

({B/R} can be paid with either {B} or {R}.)

{3}{B}, Discard a card: Target creature gets -2/-2 until end of turn.

{3}{R}: Create a 2/1 red Goblin creature token with haste. Exile it at the beginning of the next end step.

You can’t cast this spell during your first, second, or third turns of the game.

Flying, vigilance

{T}: Add {C}.

{7}, {T}: Create a 2/2 colorless Assembly-Worker artifact creature token.

Counter target spell, activated ability, or triggered ability. (Mana abilities can’t be targeted.)