Let's see what makes each of these decks unique
Note that, as with all activated abilities that don't state otherwise, Gisa's works at instant speed as long as they dont have summoning sickness, which means you can spawn blockers during your opponents turn
The only problem I see in a deck like Valgavoth is if your other draw spells dont come out and over-reliance on Valgavoth as a draw engine is eventually going to catch someones eye
Tier B Another quartet in B Tier and no mono-colored ones this time
The creature has the myriad ability, which creates temporary token copies of itself when it attacks, so that every opponent has a version of The Master Multiplied coming at them
You must pay X, and for each generic mana in that cost, you may tap an untapped artifact or creature you control rather than pay that mana