This set sees the return of proliferate - which allows you to put another counter on as many things as you want - but its the new mechanics that really stand out, because they help reinforce the story
Teferi, Temporal Archmage Theres a competitive EDH deck out there that essentially goes infinite with Teferi, Temporal Archmage, The Chain Veil, and a couple mana rocks
however, the key difference is that the Toy Workshop says you can only spend this mana to cast spells or activate abilities that put tokens on the battlefield
Its not a very flashy 1v1 card, but an excellent control commander card, similar to Casualties of War
Specifically, you get to conjure the Power Nine, which are: Ancestral Recall Black Lotus Mox Emerald Mox Jet Mox Pearl Mox Ruby Mox Sapphire Timetwister Time Walk Even better, you can blink Oracle of the Alpha a few times to get even more copies of cards like Time Walk in your deck to start taking as many turns as you need