Switching to the offensive with haste effects like Urabrask, the Hidden and Hammer of Purphoros can close games very quickly, especially after using recursion like Marshals Anthem and Sun Titan to restock your board
While we have more than enough actual slivers to choose from, there are a few changeling cards that might be considered: Mutavault, Shields of Velis Vel, Amoeboid Changeling, Blades of Velis Vel, Shapesharer, Mirror Entity, Taurean Mauler, Chameleon Colossus
I really like Impact Tremors and we recently got a card that has the same effect AND is an anthem on top
Other creatures you control enter the battlefield with an additional +1/+1 counter on them for each mana from a Treasure spent to cast them." The card is good for sure, but it's on this list because we feel as though it represents the way treasure tokens have evolved this year
Winter Moon is a lot fairer than Winter Orb, and though I think its pretty reasonable for mono-color decks to drop, the social contract is likely to keep it away from most tables
Faithless Looting also has a flashback cost of three mana, which means you can pay three mana to cast it again from your graveyard before exiling it
