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Focused on Dragon synergy, ramp, and legendary tutoring to assemble a terrifying board state

The inability to cast it as a Blade of the Sixth Pride is a pretty serious point against it, but the squad ability means that once youre spending six mana, your Anthems are spread across multiple bodies

TL;DR: There are four mechanics: Party, modal double-faced cards, Kicker, and Landfall Pathway dual lands that use the modal double-faced card mechanic

While this list does try and use the most popular combos found in the Commander format, some liberties have been taken with overly similar combos to ensure there's a good spread of colour identities

All three of them could be #1, though