Marchesa, the Black Rose

Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)
Other creatures you control have dethrone.
Whenever a creature you control with a +1/+1 counter on it dies, return that card to the battlefield under your control at the beginning of the next end step.

Unspeakable Symbol

Pay 3 life: Put a +1/+1 counter on target creature.

Herald of Secret Streams

Creatures you control with +1/+1 counters on them can't be blocked.

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