Marchesa, the Black Rose

If any creature you control with a +1/+1 counter on it dies, return it to the battlefield under your control at the end of the turn (including Marchesa herself).

Includes every variation of Act of Aggression: "gain control of target creature until end of turn, it has haste, untap it"

Gain control of target non hexproof/shroud creature, attack with it, sacrifice it, it now belongs to you, permanently.

Only downside is if you are the one with the most health!

Doesn't work with enemy commanders (as they won't enter the graveyard), and this deck needs a few different ways to make sure someone else has the most life, otherwise "dethrone" doesn't work.

Blue's "Return target creature to owners hand" is a good counter, as well as removing counters from target creature.

Any suggestions or other cards to add/remove are welcome!