Horval Expedition Captain

+2: Target creature gets +2/+2 and gains vigilance until end of turn.
-4: Create a 0/0 green Elf Druid creature token with "This creature gets +1/+0 for each elf you control and +0/+1 for each land you control."
-12: You gain 10 life. Then, creeatures you control get +X/+X and gain vigilance until end of turn, where X is your life total.