ho oh pokemon card Ho-Oh LEGEND HeartGold Collection 1st Edition 015/070 016/070 Set of 2 – Pokémon Japanese Ultra Rare Retreat cost 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

It very distinctly captures the feel of Ravnicas endless metropolis, and the color of the buildings changes to match the color of the card

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

Its also likely your playgroup will be okay with you including them in the 99 of your deck since none of the individual cards are too overpowered

Buffing your creatures is a nice touch, but I see the real reason to run this sword is for its proliferate ability