Honestly i think
quillspike would be your best attribute to the deck because it eats -1/-1 counters. If you run that in a blue/green deck that uses UNDYING then every time the creature comes back it will have a +1/+1 counter on it. Then you use your
leech bonder to move that +1/+1 counter from that creature and put it on another weak creature of yours. That way your creatures make themselves stronger. Here's an example;
[Howlgeist and strangleroot geist both have undying effects] (+) [leech bonder moves COUNTERS, negative or positive between creatures]
(+) [quillspike eats -1/-1 counters to make himself temporarily strong for the turn] (+) [devoted druid gets a -1/-1 counter in order to untap itself]
= [leech bonder TAKING undying creature's +1/+1 counters and GIVING other creatures such as
quillspike +1/+1 counters to make themselves permanently stronger, then
quillspike eating the -1/-1 counters from
devoted druid so that you'll always have that 1 green mana produced so that you can keep tapping and untapping it for
quillspike's effect. Do this enough times and then use
gilder bairn to double those +1/+1 counters and lastly play
bioshift and give all those +1/+1 counters to your
howlgeist. Game over because your spirit wolf will be the strongest thing on the field, best thing since unblockable.