Tony Stark, Earth's Defender

Creatures you control gain Vigilance
When Tony Stark, Earth's Defender enters the battlefield, you may search your library or
graveyard for Iron Man Prime. Exile it with 10 research counters on it. Every upkeep, remove a research counter. When the last one is removed,
put it onto the battlefield and untap all creatures.
{x}, {t}, Remove X Research counters
from target card.