ho oh pokemon card Ho-Oh LEGEND HeartGold Collection 1st Edition 015/070 016/070 Set of 2 – Pokémon Japanese (Dont apply Weakness and Resistance for Benched Pokémon.) Attack 2 Ho-oh Pokemon Metal Replica Card

In addition to the fact that Mega Gengar is one of the most iconic Mega-Evolved Pokmon, this cards illustration directly alludes to the lore surrounding the Ghost/Poison-types Mega-Evolved form

Plus, it's a significant enough threat on its own for 4 mana

Card Set(s) -THE TIME OF BATTLE- [OP-16] CARD VIEW OP16-034 | R | CHARACTER Monkey type card and add it to your hand

If your opponents dont counter this spell, you should win the game 99% of the time

The difference here is you get a copy also attacking whomever you are already attacking with the Siegetbreaker, and the creature itself has haste and deathtouch to get you immediate value both on swing and if it gets blocked