Instant Color tag templates(None) Assassin's Trophy Destroy target permanent an opponent controls
This is, of course, all helped by there being just so few special art cards in a very disappointing set
That precon came with all sorts of goodies for that list, so it might be worth it to revisit
Mega Altaria ex x2 Swablu (Mega Rising) x2 Iron Valiant x2 Iron Crown x2 Sabrina x1 Cyrus x1 Copycat x2 Peculiar Plaza x2 Future Booster Energy Capsule x2 Poke Ball x2 Professor's Research x2 Energy: Psychic The advantage this build has over the standard Altaria build that combines with Igglybuff is that it's a bit more flexible, if arguably slightly less effective than the Iggly/Darkrai combo at its peak
That honor, instead, goes to The First Sliver or perhaps even Sliver Overlord due to their scaling abilities
Notably, Celesteela is not available in all versions of the games