Killen, The Unshackled

All Elf's you control without a +1/+1
Counter on it have Outlast {g/u}
{3}{g} {t}:Create X 1/1 Green Elf Creature Tokens, Where X is the number of Elf's you control
{4}{g}:If you control Both Killen and Kilron
Transform them into Tamiyo's Lost Disciple