The Nomad

Basic landwalk, shroud
Players cannot sacrifice creatures to cast spells
or activate abilities.
At the beginning of combat on your turn, you
may choose a player. If you do, that player gains
control of The Nomad until the end of your turn.
When The Nomad returns to your control, that
player chooses a creature they control, you gain
control of that creature. (This effect is permanent.)