A 1/3 with flying is an average rate for a rare card these days, but the connive trigger whenever you or your opponent casts their second spell is what really makes this bird advisor tick
Amass 4, mill four, deal 4, gain 4
The card I'm talking about is the following: Thunder King Rai-Oh is one of the best cards the GX manga gave us and has been a staple in many decks ever since (safe the March 12 format, but lets forget about that horrible period)
When it was found it started a bidding war, ultimately selling to MTG superfan Post Mallone for an estimate $2 million
Still, if you had 3 creatures that you flickered even twice, that's 6 life your opponent is losing just from the call ETB, and could turn certain cards that make creature tokens even scarier
a1a-32-mew-ex is as strong as opponent's Active Pokemon, copying its attack with Genome Hacking and attacking your opponent's Pokemon with it