She provides card advantage
When you cast Bloodline Culling you can have a creature get -5/-5 until end of turn, which can be useful for killing off any specific threat, but especially those that are indestructible, as they dont die through normal means
Yahennis Expertise has a lot of people excited about the prospect of cascade-style decks, as you can combo with a Restore Balance to cast the extra copy from hand
Two days later, the average price was $500, but some copies were selling for as much as $1000
Your five mana nets you this fun 2/2 with three bodies, so five power total for five mana
With this expansion, youre now able to harness the strength of Mega Evolution Pokmon ex, using their powerful attacks and massive HP as you go up against other players from around the world