titan shield card sleeves defense TitanShield (150 Sleeves /Purple) Standard Size Board Game Trading Card Sleeves Deck Protector for Mtg, Dropmix term play Transparent | Standard Size

There are a lot of cards whose power jumps up with this card

Cubic Causality X TRAP Distribute a number of Cubic Counters on face-up monsters your opponent controls, up to the number of "Cubic" monsters you control

That Fusion Monster cannot attack your opponent's Life Points directly, and is returned to your Extra Deck at the end of the turn

While it does cost eight mana, you can easily bring that down via Convoke

I was able to play Hazel's Brewmaster, exile "Steve" from my graveyard, and use all of my creature tokens as if they were copies of the Elder

Likely more of a sideboard card and a meta call, but the kind of high upside tool you want in your sideboard arsenal