Added 21 successfully cards. Most of them profit from the newly introduced keyword=AFFINITY (thanks to Zethfox!)

[card]
name=Frogmite
abilities=affinityartifacts
text=Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
mana={4}
type=Artifact Creature
subtype=Frog
power=2
toughness=2
[/card]

Added tests for that.

Have fun!

projects/mtg/bin/Res/test/Frogmite.txt

@@ -0,0 +1,18 @@
+#Testing Frogmite (keyword:AFFINITY)
+#Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
+[INIT]
+FIRSTMAIN
+[PLAYER1]
+inplay:Mox Pearl,Seat of the Synod,Sol Ring
+hand:Frogmite
+manapool:{1}
+[PLAYER2]
+[DO]
+Frogmite
+[ASSERT]
+FIRSTMAIN
+[PLAYER1]
+inplay:Mox Pearl,Seat of the Synod,Sol Ring,Frogmite
+manapool:{0}
+[PLAYER2]
+[END]