Each player chooses an artifact, a creature, an enchantment, and a planeswalker from among the nonland permanents they control, then sacrifices the rest. If {B}{R} was spent to cast this spell, you choose the permanents for each player instead.
Destroy target nonland permanent if it's a creature or if {G}{W} was spent to cast this spell.
Create a token that's a copy of target permanent. If {R}{G} was spent to cast this spell, instead create a token that's a copy of that permanent, except the token has "When this permanent enters the battlefield, if it's a creature, it fights up to one target creature you don't control."
Flash Enchant creature Enchanted creature gets -2/-0 and loses all abilities. (Mutating onto the creature won't give it new abilities. It can gain abilities in other ways.)
Whenever this creature mutates, put a +1/+1 counter on it.
This spell has flash as long as you control a permanent with flash. As an additional cost to cast this spell, sacrifice a creature. Destroy target creature.
({T}: Add {R}.)
Vigilance
Target creature gets +7/+7 until end of turn. Up to one other target creature blocks it this turn if able. Cycling {2} ({2}, Discard this card: Draw a card.)
Whenever Momentum Rumbler attacks, if it doesn't have first strike, put a first strike counter on it. Whenever Momentum Rumbler attacks, if it has first strike, it gains double strike until end of turn.
Mutate {2}{G} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.) Whenever this creature mutates, search your library for a basic land card, put it onto the battlefield tapped, then shuffle your library.
Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle your library. Cycling {2} ({2}, Discard this card: Draw a card.)
Target opponent reveals their hand. You choose a nonland card from that player's graveyard or hand and exile it. Cycling {1} ({1}, Discard this card: Draw a card.)
Mutate {3}{W} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.) Vigilance Whenever this creature mutates, you gain 4 life.
Companion — Each nonland card in your starting deck has a different name. (If this card is your chosen companion, you may cast it once from outside the game.) Flash When Lutri, the Spellchaser enters the battlefield, if you cast it, copy target instant or sorcery spell you control. You may choose new targets for the copy.
Companion — Each permanent card in your starting deck has converted mana cost 2 or less. (If this card is your chosen companion, you may cast it once from outside the game.) Lifelink During each of your turns, you may cast one permanent spell with converted mana cost 2 or less from your graveyard.
Flash When Lurking Deadeye enters the battlefield, destroy target creature that was dealt damage this turn.