Say I cast Acidic Slime. Does my opponent get to know what I target before he has to decide to counter it? Or is he required to choose whether to counter it before knowing what I will destroy with Acidic Slime?
They'll only know if you choose to tell them that early. Because the Slime's ability triggers when it enters the battlefield, it's not until you're putting the trigger onto the stack that you have to declare a target, and it won't trigger unless it's resolved and entered the battlefield (without being countered!)
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DCI Level 2 Judge
Modern: GRB Jund BRG RBU Grixis Delver UBR Legacy: W Death & Taxes W GRB Punishing Jund BRG GUR Canadian Threshold RUG Commander: RUG Maelstrom Wanderer GUR
Modern:
GRB Jund BRG
RBU Grixis Delver UBR
Legacy:
W Death & Taxes W
GRB Punishing Jund BRG
GUR Canadian Threshold RUG
Commander:
RUG Maelstrom Wanderer GUR