Modern, monocolored (12)
Monocolored creatures can't block this turn.
Flying
At the beginning of each player's upkeep, that player sacrifices a monocolored creature of their choice.
Search your library for up to three monocolored cards with different names and exile them. An opponent chooses one of those cards. Shuffle that card into your library. You may cast the other cards without paying their mana costs. Exile Emergent Ultimatum.
Hexproof from monocolored
Whenever you cast a multicolored spell, create a 4/4 red and white Golem artifact creature token.
Gain control of target monocolored creature.
Forecast — , Reveal Govern the Guildless from your hand: Target creature becomes the color or colors of your choice until end of turn. (Activate only during your upkeep and only once each turn.)
Protection from monocolored
Flying, hexproof from monocolored
Each instant and sorcery card in your graveyard that's exactly two colors has jump-start. (You may cast that card from your graveyard by discarding a card in addition to paying its other costs. Then exile it.)
Sphinx of the Guildpact is all colors.
Hexproof from monocolored (This creature can't be the target of monocolored spells or abilities your opponents control.)
Choose one —
• Destroy target monocolored creature.
• Destroy target artifact or enchantment.
• Draw two cards, then discard a card.
Tarnation Vista enters tapped. As it enters, choose a color.
: Add one mana of the chosen color.
, : For each color among monocolored permanents you control, add one mana of that color.
Destroy target monocolored creature.
Exile target monocolored permanent.
Gatherer works better in the Companion app!
: Add one mana of the chosen color.
, : For each color among monocolored permanents you control, add one mana of that color.