COMENTS
CopyFurries: With Horned Frogs it's a particularly complicated way of casting Parallel Universe, and even by then it's costly enough to be balanced. To set up one copy, you need either 2 cards and a turn with a total cost of 9
(and 1 turn) or a Parallel Universe, costing 7
1 card and instantly.
To set up 6 copies, you need 7 cards, 7 turns and 29
or 36
, 6 cards and even as much as all on one turn.
So, balanced.
Woodshield Tree: Seems fine to me. 5 damage can be dealt even with a Thunderbolt or after-two-turns Elite Otyugh or anything similar. You could add a clause that being frozen stops the effect for the duration of freeze, but that's optional. Oh, and it hampers any buffs you would like to play, so it's fine.
Life Cycle: An ending-push-PU. Or something. Seems fine. Also, lolscyther
Tanks: The ability is a bit controversial, but I give my approval. It costs 6 Gravity to protect some creature's bacon, and it can be devoured immediately by an Elite. I take it this'd reduce its HP to 0?