KRoNK, The Pack Master

Whenever a Gnoll or another KRoNK enters the battlefield, you may pay {r/g} . If you do, create a legendary 1/3 Blue Elf token creature with "when
this token is removed from the battlefield,
search your graveyard or library for a card named:
"KRoNK, War Leader"
If you searched your library this way, shuffle it"