Added entwine cards and other cards as of SVN r4587.
Entwine Cards
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Incite War
Journey of Discovery
Promise of Power
Roar of the Kha
Rude Awakening
Savage Beating
Solar Tide
Stir the Pride
Temporal Cascade
Tooth and Nail
Wail of the Nim
Cards from Unsupported
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Circle of Protection: Shadow
Circle of Solace
Cloudstone Curio
Coalition Relic
Commando Raid
Copy Artifact
Cornered Market
Crack the Earth
Crag Saurian
Crescendo of War
Crypt Champion
Curfew
Dance of the Dead
I don't have an exact amount of cards supported in the latest SVN because there are a lot of cards in my local copy to be tested before commiting.
OT: I think overload card can be done if the target card and store it for use until the spell resolves. ex:
[card]
name=Blustersquall
other={3}{U} name(Overload)
auto=if paid(alternative) then tap all(creature)
auto=ifnot paid(alternative) then tap all(mytarget)
text=Tap target creature you don't control. -- Overload {3}{U} (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")
mana={U}{target(creature|opponentbattlefield)}
type=Instant
[/card]