Ugin's Insight (Ripple Foil) [Modern Horizons 3 Commander] BT15-076 that Mountain produces colorless mana

that Mountain produces colorless mana instead of any other type

why so slow

Set: Starter Deck: Dragon of Courage Card type: Tamer Rarity: Rare Play Cost: 4 [Start of Your Turn] If you have 2 or fewer memory

You may put a permanent card with mana value 3 or less from among them onto the battlefield with a shield counter on it

Ugin's Insight (Ripple Foil) [Modern Horizons 3 Commander] BT15-076 that Mountain produces colorless manaSet: Modern Horizons 3 Commander Type: Sorcery Rarity: Rare Cost: {3}{U}{U} Scry X, where X is the highest mana value among permanents you control, then draw three cards. "You speak to me of the threat of Ulamog. But do not forget: they came as three." Ugin, to Jace Beleren