Delock, Rogue Ecomancer

At the beginning of combat on your turn, detain up to 1 target creature, then return up to 2 target cards in a single graveyard to the bottom of their owner's library.

{1}{b}: Put a -1/-1 counter on target creature.

{g}{u},{t}: Put a +1/+1 counter on each of up to 2 target creatures, then proliferate.

{u}{b}{g}{x}: +X/+X Flying Trample and Lifelink until end of turn. Draw X cards, lose X life. You may play half X, round down, additional land this turn.