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Im of the opinion that all Commander decks should have a plan for the graveyard in some form, regardless of the commander you choose to run

Echoing Assault I didnt think too much of Echoing Assault at first, but its been creeping up for a lot of players since its release in Bloomburrow Commander

This is a big downside, and hurts this cards chances of thriving in Expanded because the original Mewtwo-EX can take it down pretty easily, but it still has plenty of potential in Standard

Who is it

If a "Blackwing" Synchro Monster(s) or "Black-Winged Dragon" is Special Summoned to your field, while this card is in your GY (except during the Damage Step): You can banish this card, then target 1 "Blackwing" monster in your GY

This could also have contributed to the high demand for the card, as players around the world will have to seek out the English-language versions