vintage mtg booster box Magic: The Gathering Repacks - 1 Rare Per Pack - Bonus Foils/mythics/planeswalkers Possible Old Magic: The Gathering booster

Ragavan, Nimble Pilferer, Sol Ring, Mana Vault, Delver of Secrets, all flavors of Llanowar Elves the list goes on

Transforming it into Ravager of the Fells can remove creatures

There are even some Vampires with the madness keyword which means you're able to play them as you discard them

I also run ramp spells like Three Visits (thank god for reprints), Nature's Lore, Skyshroud Claim, Smothering Tithe, The Great Henge (which costs only two mana when Sliver Overlord, Sliver Legion, Sliver Queen, or The First Sliver are out), and 'rocks' like Mana Crypt, Sol Ring, Arcane Signet, and Chromatic Lantern which can't help cast the Sliver lords, but CAN help cast Morophon, the Boundless or pay for Sliver Overlord's tutor

Here we see him hanging ten on his surfboard, chasing after his favorite peanut butter sandwich

Since your deck will be full of instants and sorceries anyway, that prowess ability can grow it into a 4/5, 5/6, or something waaay bigger depending on how many cards you can play in a turn