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1 Ulvenwald Mysteries

When Contagion Clasp enters the battlefield, put a -1/-1 counter on target creature

For example, Aeve, Progenitor Ooze can make copies of itself when it Enters, but it states it's not Legendary if it's a token, so the copies do not trigger the rule

If you only have a handful of targets, even if they are good and important ones you are still going to get limited value with Leap

Considering that black is the colour of sacrificing your own creatures for big effects, this can easily turn into a major card draw engine

However, if you haven't sacrificed any Foods this turn as your end step begins, the ability won't trigger at all