"Caius the Shadow Monarch" and "Raiza the Storm Monarch" are the best choices, as they offer alternatives to overcome certain monsters in difficult matchups where control strategies don't work
PS Platinum Secret Rare QCSE Quarter Century Secret Rare The White Stone of Ancients X LIGHT Level 1 [ DragonTunerEffect ] ATK 600 DEF 500 Once per turn, during the End Phase, if this card is in the GY because it was sent there this turn: You can Special Summon 1 "Blue-Eyes" monster from your Deck
increase or decrease this cards Level by the number banished, until the end of this turn
Lapras, Blastoise EX, and Articuno EX, Misty benefits all of them and can very quickly give the player the advantage in a match
Its no wonder that Cloudshredder Sliver is played in many sliver decks ranging from EDH to more niche Modern combo decks
You can call this deck BUNCH OF FUSION DRAGONS, because that is what it was named by the duelist who made it