Shaman of the Old Ways

Ferocious — Whenever a creature with power 4 or greater enters the battlefield under your control,
draw a card, then discard a card.
Exile Shaman of the Old Ways: The next
creature spell you cast this turn has delve.
(Each card you exile from your graveyard while
casting that spell pays for {1}. Multiple instances of
delve on the same spell are redundant.)
"Knowledge from nature must be preserved."