mtg card ability rules A magic corner of the Universe: Mana abilities and Caged Sun What Is a Mana Ability

Removing an artifact or creature, even temporarily, provides a powerful boost, if only because you get in an extra attack or two

Or hey, just pay the white and four generic mana, and ultimate away one planeswalker from another ones loyalty stash

Those cards are: Archaeomancer's Map Archaeomancer's Map, shown below, is not only a slice of the iconic white ramp card Land Tax but also acts as a pseudo-Burgeoning that triggers off of opponents having more lands than you do

Even with myriad you're still only getting a temporary advantage, so you should make sure you either borrow something that's going to leave a mark, or lean on sacrifice effects to circumvent giving the creature back

If you're looking for a fun go-wide Equipment deck, I'd highly recommend the Final Fantasy VII precon