cards like solemnity mtg MTGNexus or lands Solenidade MTG - Hour of

You'll put a +1/+1 counter on both creatures

10 Mono-Black Devotion Mono-black devotion is a classic deck from the original Theros sets, and it makes a comeback in Theros Beyond Death

We already play Firebrand Archer in EDH decks that buff damage, and some of those commanders are in Standard, like Ojer Axonil, Deepest Might / Temple of Power, Ob Nixilis, Captive Kingpin, Urabrask / The Great Work, Taii Wakeen, Perfect Shot, Judith, Carnage Connoisseur, and Imodane, the Pyrohammer

This list comes in at 55 cycling cards

or unattach from a creature

When utilized in Commander, Guardian Project goes from a niche option to a highly reliable card-draw powerhouse