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As long as Omnath, Locus of All remains under your control, you'll retain unspent mana as steps and phases end, although that mana will become black

If an activated ability or triggered ability has an effect that depends on your devotion to a color, you count the number of mana symbols of that color among the mana costs of permanents you control as the ability resolves

Shiranui Style Synthesis English - Near Mint - 1st Edition Product Details Number : BOSH-EN065 Rarity : Common Attribute : SPELL Card Type : Spell Card Description : Once per turn, if you control no monsters: You can send 1 card from your hand to the Graveyard, then activate 1 of these effects

Emboar has an interesting effect that could raise the viability of fire type decks

They were given out with purchases at Pokemon Centers in Japan and America.

While its considered strong enough to be banned in all but the TCG Traditional format, its a potent spell that many might find super underwhelming