Then you can exile a graveyard and gain a bunch of life, ramp out two lands of any type not just basics tapped, make a pair of 2/2 Bear tokens, or toss a pair of counters on all of your stuff for the going wide, and with the Bears as a default that's two 4/4s for six mana on a naked board
For instance, you only cast the room once unlocking the second door is a special game action which just happens to share the same mana cost and timing rules as casting it would
It seems like $50 is a reasonable amount, so lets start there
This ability can really hamper the early games plans of anyone or a number of players use of mana rocks, and even though they get to choose, I still think this is better than getting three squirrels
In the English version, these cards contain both vertical and horizontal holofoil lines as well as foil on the card name, while the Japanese variant features a more uniform holofoil covering the entire card surface