At the beginning of your end step, each player loses 4 life unless they sacrifice a nontoken creature.

Swampcycling (, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

Backup 2 (When this creature enters the battlefield, put two +1/+1 counters on target creature. If that's another creature, it gains the following ability until end of turn.)

Menace

Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)

As long as Lightning Mauler is paired with another creature, both creatures have haste.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Renown 2 (When this creature deals combat damage to a player, if it isn't renowned, put two +1/+1 counters on it and it becomes renowned.)

Trample, hexproof

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Changeling (This card is every creature type.)

Whenever an opponent casts a spell, you may put a +1/+1 counter on Taurean Mauler.