Ink-Eyes, Servant of Oni reanimates things from other players graveyards while Nashi, Moon Sage's Scion steals their cards
It just uses the word, "Swamp." Another good example is extort, which has the Black and White symbols in the reminder text, or a fetchland like Mountain Valley that clearly is Red and Green in flavor and mechanically, but is allowed in decks without Red or Green
After doing that, theres no particular order to spending the rest of your turn, and you can do them any number of times as long as you have the ink to spend, and cards out in the field are not exerted
Higher cost and table threat perception demand careful play, but the payoff comes through unmatched late-game control
Iona, Shield of Emeria Not a fun card and not a card often cast