Whoops, typo on the word single, just noticed that right after i posted.
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Ok, not to sound mean, but i completely stopped reading your comment when you said "I don't really see how Skull Clamp really helps you". Perhaps you misunderstood what type of deck this is, elf clamp is an incredibly powerfull/broken combo revolving around the card skullclamp, without it the deck is 100% pointless. Because skullclamp lets you play then kill tons of elves in a ginsle turn, caller of the claw and wirewood hivemaster are possibly two of the most neccessary cards to making the deck work after skullclamp and priest of titania.
^^^ No, you need the creature to be in play yo use its regeneration ability.