Tolaria West

Tolaria West enters tapped.
{T}: Add {U}.
Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with mana value 0, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

The List

Time Spiral Remastered

Tolaria West enters the battlefield tapped.
{T}: Add {U}.
Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with converted mana cost 0, reveal it, put it into your hand, then shuffle your library. Transmute only as a sorcery.)

From the Vault: Lore

Tolaria West enters the battlefield tapped.
{T}: Add {U} to your mana pool.
Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with converted mana cost 0, reveal it, and put it into your hand. Then shuffle your library. Transmute only as a sorcery.)

Future Sight

Tolaria West comes into play tapped.
{T}: Add {U} to your mana pool.
Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with converted mana cost 0, reveal it, and put it into your hand. Then shuffle your library. Play only as a sorcery.)

Cards with mana cost {0} (like Pact of Negation) and cards with no mana cost (like Ancestral Vision and Tolaria West itself) have mana value 0.