Rannundar's Curse

When Rannundar's Curse enters the battlefield,
choose up to X target creatures. Gain control of
each of those creatures until Rannundar's Curse
leaves the battlefield.
Creatures you control but don't own have base
power and toughness X/X, are djinns in addition
to their other types, and have flying and haste.
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"The endgame has begun.