Flying
{T}: Add {U}. Spend this mana only to cast an artifact spell.
{T}: Add {U}{U}. Spend this mana only to activate abilities of artifact sources.
It harnesses energy from the brutal, mana-rich storms found deep within Uthros.
1/1
Legalities
tlrlegal
duellegal
brawllegal
pennynot legal
PreDH
Rulings · 1
wotc
An “artifact source” is any object with the card type artifact. This means you could spend the mana from Steelswarm Operator’s last ability to activate an ability of an artifact you control or an artifact card in your hand or graveyard, for example.
Notes
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