Ox of Agonas

Each creature you control gets +1/+0 for each time it has attacked this turn. Landfall — Whenever a land you control enters, if it's your main phase, there's an additional combat phase after this phase. At the beginning of that combat, untap all creatures you control.

Whenever Sethron or another nontoken Minotaur you control enters, create a 2/3 red Minotaur creature token. 2B/R: Minotaurs you control get +1/+0 and gain menace and haste until end of turn. (B/R can be paid with either B or R.)

+1: Each opponent discards a card and loses 2 life. −3: Gain control of target creature until end of turn. Untap it. It gains haste until end of turn. Sacrifice it at the beginning of the next end step if it has mana value 3 or less. −8: Each opponent loses life equal to the number of cards in their graveyard.

Tahngarth can't be blocked by more than one creature. Whenever an opponent attacks with one or more creatures, if Tahngarth is tapped, you may have that opponent gain control of Tahngarth until end of combat. If you do, choose a player or planeswalker that opponent is attacking. Tahngarth is attacking that player or planeswalker.