mtg invocation cards Masterpiece Doomsday #42 [Amonkhet Invocation] Put the chosen cards on top of your library in any order Kefnet the Mindful · Amonkhet

If an activated ability of a creature you control costs no generic mana to activate (for example, if it costs , it costs, or it costs only nonmana actions such asor "Sacrifice a creature"), Training Grounds simply won't affect it

If Lurrus of the Dream-Den is your companion, you can potentially use the Sleeper Dart as a card draw engine, while also locking a creature down indefinitely

That makes it a quiet, but effective backbone for generating extra mana each turn across all kinds of decks

Plus, decks centered around Titania, Protector of Argoth or other legends that reward you for sacrificing lands can turn this cards additional casting cost into a benefit