That flexibility makes it one of the most reliable MTG black cards for cleaning up crowded boards, especially against decks led by popular token commanders
If your Skill Card doesnt say when you can activate it, then you can only activate it during your Main Phase when there is no Chain being built or resolved
For example, it makes Rapid Strike a worse choice, despite an otherwise good matchup spread (outside of the dreaded Mew VMAX matchup)
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Later, you can win with your black win conditions, like Gray Merchant of Asphodel, Exsanguinate, or Torment of Hailfire
Blighting creatures has an impact on the game no matter what, with you either drawing cards or having opponents lose one life