At the beginning of your upkeep, flip a coin. If you lose the flip, sacrifice Planar Chaos. Whenever a player casts a spell, that player flips a coin. If they lose the flip, counter that spell.
Near Mint - $13.10
Lightly Played - $11.80
Played - $9.20
Heavily Played - $7.90
Damaged - $6.60
Near Mint Non-English - $13.10
Lightly Played Non-English - $11.80
Played Non-English - $9.20
Heavily Played Non-English - $7.90
Damaged Non-English - $6.60