A-Bruenor Battlehammer

Not yet bracketed (or genuinely unplaceable).

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4cmc 5/4 Brawl commander; static ability grants +2/+0 per Equipment attached to each creature you control — stacking per-attachment, not per-Equipment type. Free activated ability (0 mana) attaches any Equipment you control to any creature, sorcery-speed once per turn. Signature in equipment-voltron shells where stacking multiple pieces on one creature creates massive power boosts, and also rewards go-wide boards where even one Equipment per creature multiplies. Requires equipment density to function; dead without a critical mass of Equipment.