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 - $5.50
Lightly Played - $5.20
Moderately Played - $4.90
Heavily Played - $4.40
Damaged - $3.60
NM-Mint Non English - $5.50
Lightly Played Non English - $5.20
Moderately Played Non English - $4.90
Heavily Played Non English - $4.40
Damaged Non English - $3.60