The most likely reasons are if it's sacrificed, if it's legendary and another legendary permanent with the same name is controlled by the same player, if it's a planeswalker and another planeswalker with the same subtype is controlled by the same player, if it's a creature with toughness 0 or less, or if it's an Aura that's either unattached or attached to something illegal
This may not be as powerful as doubling death triggers, a la Teysa Karlov, but it can be a fun addition to blink decks
Knowing when to sell graded Pokmon cards can seriously maximize your profit
Then you may have it become a copy of another creature you control until end of turn
This isn't ramping in the traditional sense either, but it gives you an additional chance to not miss a land drop
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