"Dash [cost]" means "You may cast this card by paying [cost] rather than its mana cost," "If this spell's dash cost was paid, return the permanent this spell becomes to its owner's hand at the beginning of the next end step," and "As long as this permanent's dash cost was paid, it has haste." If you choose to pay the dash cost rather than the mana cost, you're still casting the spell
In the future I plan to test more Riddler decks
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Armageddon Three simple words are enough to strike fear into the hearts of all EDH players: Destroy all lands
The Japanese versions are gorgeous and far more desirable than the global art versions, as well as being in lesser supply in the first place
Threats such as Sen Triplets and Yurlok of Scorch Thrash can be cast thanks to this formidable 5-color sorcery