Ambiguity

Enchantment, 2UU (4)
Whenever a player plays a spell that counters a spell that has been played or a player plays a spell that comes into play with counters, that player may counter the next spell played or put an additional counter on a permanent that has already been played, but not countered.¹
Illus. Stephen Daniele

Format Legality	Banned in Vintage, Legacy, Extended, Standard
Printings (1/1)	Unhinged (Rare)