Sylvan Yeti

Sylvan Yeti's power is equal to the number of cards in your hand.

Jackalope Herd

When you cast a spell, return Jackalope Herd to its owner's hand.

The Wise Mothman

Flying
Whenever The Wise Mothman enters or attacks, each player gets a rad counter.
Whenever one or more nonland cards are milled, put a +1/+1 counter on each of up to X target creatures, where X is the number of nonland cards milled this way.

Ravenous Chupacabra

When Ravenous Chupacabra enters, destroy target creature an opponent controls.

Wiitigo

Wiitigo enters with six +1/+1 counters on it.
At the beginning of your upkeep, put a +1/+1 counter on Wiitigo if it has blocked or been blocked since your last upkeep. Otherwise, remove a +1/+1 counter from it.

Shape of the Wiitigo

Enchant creature
When Shape of the Wiitigo enters, put six +1/+1 counters on enchanted creature.
At the beginning of your upkeep, put a +1/+1 counter on enchanted creature if it attacked or blocked since your last upkeep. Otherwise, remove a +1/+1 counter from it.

Frostpeak Yeti

{1}{S}: Frostpeak Yeti can't be blocked this turn. ({S} can be paid with one mana from a snow source.)

Lonis, Cryptozoologist

Whenever another nontoken creature you control enters, investigate.
{T}, Sacrifice X Clues: Target opponent reveals the top X cards of their library. You may put a nonland permanent card with mana value X or less from among them onto the battlefield under your control. That player puts the rest on the bottom of their library in a random order.

Lurking Chupacabra

Whenever a creature you control explores, target creature an opponent controls gets -2/-2 until end of turn.