Its saboteur ability allows you to cast one card from the top of a given library, yours or theirs
Those two cards are fairly expensive as they are already very good cards in their own right
As the trampler only needs to assign what would be lethal damage to each blocker before assigning the excess to the defending player, giving your trampler deathtouch is very helpful
P/T Set Number 89 Language Italiano Legal Formats Commander, Legacy, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Modern, Pauper, Pioneer, Standard, Timeless Rulings (6/6/2025) As long as at least one creature card was discarded this way, you'll create a Moogle token, and as long as at least one noncreature card was discarded this way, you'll put a +1/+1 counter on each Moogle you control
As I say, there's a lot going on for a fairly high cost, and I struggle to see this card seeing too much play given the setup required to cast it for its Shift cost, especially in Ruby & Steel decks which typically skew far more aggressive
The element of surprise leaves opponents unlikely to anticipate or prepare counterplay for a card like Reincarnation, and its a pretty powerful card even by the standards of black reanimation