Urza's Gambit

Until end of turn, target player can't attack or
block with a creature unless he or she pays {1}, can't activate the ability of a creature unless
he or she pays {2}, and can't cast a spell from his
or her hand unless he or she pays {3}.
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"Had I known that old fool would stop our advance,
I would have ensured the regiment marched through
the Baroglesh, rather than Halden."
- Emperor Sias Gultan