Jeff.

: All green creatures you control are now +20/+20 with trample and haste.
+10: Give target green creature +4/+4 and Hexproof until end of turn, double if it's an Elk creature.
-20: When Jeff. reaches 30 loyalty, create 30 5/5 Elk token creatures with Trample and gain +2/+2 each creature that dies.