For example, it can't be used during the resolution of an ability that says "Counter target spell unless its controller pays 3." If an artifact you control has a mana ability with T in the cost, activating that ability while casting a spell with improvise will result in the artifact being tapped when you pay the spell's costs
(That includes lands, artifacts, and planeswalkers.) #3
Plus, a well-timed counterspell will stop it from becoming a problem in the first place
There can be small tolerances for trimming and cutting in large production runs, or millimeters may round a bit
This amazing supporter card allows players to discard their hand for a generous seven new cards, which can be utilized as a strategic move or game saver depending on the match
The ability to fill the graveyard and then bring back dozens of game-altering enchantments with one four-casting-cost sorcery was just too powerful