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 - $7.30
Lightly Played - $6.60
Moderately Played - $5.80
Heavily Played - $5.10
Damaged - $3.70
NM-Mint Non English - $7.30
Lightly Played Non English - $6.60
Moderately Played Non English - $5.80
Heavily Played Non English - $5.10
Damaged Non English - $3.70