Cavern-Hoard Dragon does have one significant advantage that Dockside never had, which is being a giant hastey flampling 6/6 dragon, which I hear has its perks
Raw Power : These cards are on the list simply because their impact is so drastic that you often come out way further ahead than cards would typically allow
Seal of the Guildpact's last ability doesn't change the mana cost or mana value of any spell

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Allowing you to untap, protect, and then deal damage with a creature, this one mana green instant does it all