I guess, whenever a creature enters the battlefield under my control, I can put a token card somewhere and reveal it and then I can put the converted mana cost which is zero on the token
Even without stacking a ton of spells, being able to tutor one dragon straight onto the battlefield is powerful but when you storm off, you could end up putting three, four, or even five dragons into play all at once
The Grixis Twobert generates decks and games that look very different from that though
Even without that, a 7/4 indestructible (who gives himself menace) for two generic, one red, and one white can be a terrifying piece on the battlefield
For a mere , it all adds up to an excellent support piece in the strategy
Still, realistically, you should probably play basics over my off-color duals and play some other trump like Curse of Echoes or more counterspells instead