Oath of Remembrance

[Lunar Origins]

Oath of Remembrance

[ Spell // Equip ]

Cannot be destroyed by Spell cards.  For every card that leaves the field while "Oath of Remembrance" is on the field:  Put 1 Remember counter on this card. A monster equipped with "Oath of Remembrance" gains 200 ATK for each Remember counter on the field.  During either player's turn, except during the Battle Phase:  You can target 1 monster;  Equip this card to that monster.  When this card is sent to the Graveyard:  Draw 1 card.

 

It rewards combo decks you play and punishes combo decks your opponent plays.

[Snatch Steal]

Being a floater helps, and the fact that they can't MST it also helps. If they stack, though, then the monster could quickly gain upwards of 2000 ATK. That's not exactly threatening, though, unless you have something like Kaiser Colosseum, in which case gg. 

Switching equips is petty unique, and probably one of the best aspects of the card. 

It's searchable with Power Tool Dragon and Hidden Armory, so decks that can use those could make use of this card.

[Trebuchet MS]

The biggest problem plaguing Equips is that when you get rid of the monster that's equipping it, the Equip also goes, turning into extra card advantage were it not for recent Equips floating to minimize 2-for-1s.

 

But this is unique. The ability to switch on demand at Quick Effect speed, in addition to Spell destruction immunity and eventual floating, is quite a boon. This adds an additional layer to the tenacity of the Equip Spell and makes it stand out, even though all it does is grant a snowballing stat boost. Mere stat boosts look boring on paper but can be potentially decisive in the 2000-3000 bracket.