Vow to Erebor

Two mana for a temporary +2/+2 is generally too low-impact for maindecks; the untap and Dwarf Equipment clause need unshown support.

Could be wrong if A strong Standard Dwarf/Equipment shell could turn the attachment mode into a meaningful tempo play.

Pioneer's efficient threats and interaction leave little room for a one-shot combat trick without a proven Dwarf Equipment payoff.

Could be wrong if An established Equipment strategy may value instant-speed attachment more than the supplied context indicates.

A two-mana temporary pump spell neither advances a fast proactive plan nor answers Modern's key threats efficiently.

Could be wrong if A dense Dwarf Equipment synergy shell could make the otherwise poor rate acceptable.

Legacy demands exceptional efficiency or unique synergy; this is a narrow two-mana combat trick with no card advantage.

Could be wrong if A future or overlooked Dwarf Equipment engine could create a specialized use.

Untap plus +2/+2 can win combat, but it is less reliable than Pauper's efficient threats and removal absent a supported Equipment shell.

Could be wrong if Common Dwarf density and a viable white Equipment deck are not supplied.

It can surprise-block and bypass an equip cost on a Dwarf, but one temporary pump effect is low-impact in multiplayer.

Could be wrong if High-value Equipment and repeatable Dwarf-focused payoffs could make the free attachment materially stronger.

A +2/+2 untap trick is a serviceable combat swing; Dwarves and Equipment can add upside, but their density is unknown.

Could be wrong if The card rises with plentiful Dwarves/equipment and falls sharply in a removal-heavy or trick-hostile format.