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 target creatures and/or players.
Draw a card.
At the beginning of the end step, sacrifice Groundbreaker.
Other Elf creatures you control get +1/+1.
G, T: Put a 1/1 green Elf Warrior creature token onto the battlefield.
T: Add 1 to your mana pool.
1: Mutavault becomes a 2/2 creature with all creature types until end of turn. It's still a land.
Whenever you draw a card, Niv-Mizzet, the Firemind deals 1 damage to target creature or player.
T: Draw a card.
((B/R) can be paid with either B or R.)
3B, Discard a card: Target creature gets -2/-2 until end of turn.
3R: Put a 2/1 red Goblin creature token with haste onto the battlefield. Exile it at the beginning of the next end step.
You can't cast Serra Avenger during your first, second, or third turns of the game.
Vigilance (Attacking doesn't cause this creature to tap.)
7, T: Put a 2/2 colorless Assembly-Worker artifact creature token onto the battlefield.
Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.)