Well, one place where you really want to prevent players from casting spells is when you use Ur-Dragon's ability, which IS in combat
Holographic pattern: Real holographic cards have a distinct, high-quality foil pattern, while counterfeit cards may have a low-quality, dull, or incorrect foil pattern
Like most Pokmon cards, the value of Dragonair depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Dragon Majesty)
At the same time, responsible gaming measureslimits, reminders, and cooling-off toolsshould be surfaced in-context so they are easy to set and review
Rampant Rejuvenator Green is the best colour for ramp, and Rampant Rejuvenator might well be one of the biggest ramp cards ever printed in terms of how many lands it can dump onto the battlefield