Ask-the-Judge (Magic: the Gathering Rules & Policy Group) | Opponent has new Urza in play and I play eidolon of rhetoric, can he activate urza's 5 mana ability to “play” the top
Herald of Anguish (Aether Revolt)
Everything You Need to Know About Activated Abilities in Magic - Draftsim
MTG : Mana Abilities
TIL Karn's Sylex still lets you pay life to use mana abilities. My opponent seemed pretty confused too once they started hovering over the sylex and their own thran portal, then immediately
A magic corner of the Universe: When mana abilities make a difference
How Deathrite Shaman's targeted abilities work. - Magic Rules Tips
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Ask a Magic Judge — magicjudge: You can't use mana from Eldrazi...
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Leather Armor [The List]
Everything You Need to Know About Activated Abilities in Magic - Draftsim
Everything You Need to Know About Activated Abilities in Magic - Draftsim
MTGNexus - Sudden Silence
Quagnoth
Do I pay mana when activating tergrid's ability? : r/mtg