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Oathbreaker is a variation of the regular Commander format that limits the design space of your decks a bit in exchange for giving you a spell in the Command Zone

Tannuk, Steadfast Second (Mythic) Grants haste to all your creatures and warp to your artifactsgreat for pushing damage and keeping the pressure up

Especially in the Commander format, blink-focused strategies helmed by commanders like Brago, King Eternal are remarkably popular and powerful

This is why Strixhaven has some spells that copy themselves under certain conditions

Tutors, fast mana, and infinite combos are the bread and butter of this tier, with most decks overflowing with plenty of each