Some abilities allow you to unlock a door of a Room you control
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The Best Cards With Split Second Spells with split second tend to cost a little more mana than their more interactive equivalents, so the best ones are either mechanically unique spells or effects that you need to resolve without your opponents' interference
In my initial build, I decided to go with a more aggressive deck in the mold of Theros s Mono-Blue Devotion to see if Heliod is a worthy successor to the original Thassa
So, suppose I have the flash creature [c]Crystacean[/c] in hand, alongside a normal creature, like [c]Alpine Watchdog[/c]
As for the actual card, being able to copy an entire stack worth of instants and sorceries on an uncopyable spell
