Trial
{W}{U}Instant
Return all creatures blocking or blocked by target creature to their owner's hand.
Trial // Error
{W}{U} // {U}{B}
Instant // Instant
Oracle Text
Error
{U}{B}Instant
Counter target multicolored spell.
Watch Out
Static ability — always active, can't be responded toRules Note
This card has a static ability that applies continuously as long as it's on the battlefield. There's no trigger or activation — the effect just exists. Removing the permanent is the only way to stop it.