Imagine casting this with 7 mana to give +5/+5 and trample to a creature, which is hard enough to deal with on its own, but then youll be left with a 5/6 trample when that creature is dealt with
(And the Menace doesn't gain you any life, dorks are untapped, and you can't madness for more later.) At least Conqueror's Pledge gives you the chance to kick it for double tokens, not even Bestial Menace can do that
This may contain incomplete changes in progress
Delve has been printed on creatures, instants, and sorceries so far, and we could see it on other permanent types in the future, but Teval, Arbiter of Virtue gives it to all your spells
This effect is great for Commander, where when you cast it from your command zone again and again and use the cards exiled earlier in the game