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.
NM-Mint - $10.90
Lightly Played - $9.80
Moderately Played - $8.70
Heavily Played - $7.60
Damaged - $5.50
NM-Mint Non English - $10.90
Lightly Played Non English - $9.80
Moderately Played Non English - $8.70
Heavily Played Non English - $7.60
Damaged Non English - $5.50