Mercer

Haste, Vigilance, Flash
{t}: Take control of target creature, that creature becomes Mercer, with all of their abilities in addition to Mercers. Mercer adds his power and toughness in +X/+X counters equal to his power and toughness.
Mercer ignores Shroud, Shadow, and all protections. If Mercer dies while attached to another creature, the creature he is attached to dies and Mercer remains on the battlefield.