Chalk one up for Gilder Bairn...

Change the text of target spell or permanent by replacing all instances of one creature type with another. The new creature type can't be Wall. (This effect lasts indefinitely.)

All Forests and all Saprolings are 1/1 green Saproling creatures and Forest lands in addition to their other types. (They're affected by summoning sickness.)

, : Double the number of each kind of counter on target permanent. ( is the untap symbol.)

Devour 2 (As this creature enters, you may sacrifice any number of creatures. It enters with twice that many +1/+1 counters on it.) At the beginning of your upkeep, create a 1/1 green Saproling creature token for each +1/+1 counter on this creature.

Activated abilities of creatures you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana.