Quote from RampartQuote from WyvernSlayerI think that, with 3 Tolaria West in the deck, having 4 Chalice of the Void may be excessive.
Trinisphere is golden against Dredge and Omniscience decks. Beyond that, it's basically a slower Sphere of Resistance.
If I had to choose between SoR and 3-Sphere, I'd take the former. Less crippling, but applicable to a wider variety of matchups.
3-ball also doesn't effect cards like Show and tell, Big Jace, Blood Moon, Cunning Wish, Intuition etc. that is a big deal in some matchups. Having Sneak attack being 5 mana is big game.
True. They also stack, which is big. Trinisphere doesn't do much in multiples.