These include creatures such as Agent Frank Horrigan (indestructible, proliferate), Alpha Deathclaw (destroys permanents), Consuming Aberration (mill), Ezuri (proliferate, card draw), Fathom Mage (evolve, card draw), Lily Bowen (+1/+1 counters, life gain), Marcus (card draw, +1/+1 counters), and many more
I have done one of these before but it was a bit of a mess
If that creature dies this way, its controller creates two tokens that are copies of that creature, except their base power is half that creature's power and their base toughness is half that creature's toughness
Crew 1 The Lunar Whale lets you look at the top card of your library whenever you want (with one restrictionsee below), even if you don't have priority
The two creatures arent on the battlefield at the same time