It adds nothing to the board, and making spells cost an additional mana isnt a particularly desirable effect unless it comes with a creature attached
Often referred to as "Superfriends" decks, these decks seek to utilize as many Planeswalkers as possible, containing numerous cards that let their controller get additional value out of these aforementioned Planeswalkers
Yes on all counts, with one important note about intellectual property
Im even going to try this one out: Creatures (23) 4 Rattleclaw Mystic 3 Whisperwood Elemental 3 Den Protector 2 Deathmist Raptor 3 Nissa, Vastwood Seer 4 Hangarback Walker 2 Oblivion Sower 2 Ulamog, the Ceaseless Hunger Planeswalkers (3) Lands (26) Spells (8) From Beyond gets better when the 1/1s actually threaten to trade with stuff and when you go up on fetchable Eldrazi options
Wizards might have avoided the divine when building Dominaria, but there was no way they could ever realize their vision for Theros without a proper pantheon
Desynchronization and Urza's Ruinous Blast are potent board wipes that work well in this legendary-heavy deck
