Mind Stone

Equip {0}
When equipped, Target Creature takes 4 damage
for each equipped Infinity stone
Equipped Creature gains: You may choose not to
untap this creature during your untap step.
{t}, Gain Control of target creature for as long as this creature remains
tapped. You may choose any number of target creatures if you also equipped Power Stone.
If you Equip all 6 Infinity Stones, Target player wins the game.