It arrives untapped, taps for colorless, then taps with just two to force everyone to draw, discard too so everyone Loots one (Merfolk Looter)
At the start of your combat step, all your Merfolk creatures explore, revealing the top card of your library and putting it into your hand if its a land, or giving that Merfolk a +1/+1 counter and then letting you choose to keep it on top of your deck or into your graveyard
Raya already quests for two lore, and being able to ready another character who has already challenged or quested could allow for even more
Death Period can instantly dispatch an opponents Pokmon when the right number of damage counters are in place, while Claw of Darkness provides a powerful 200-damage strike alongside hand-disruption potential
However, there are much better options if you are looking for a five-cost Evasive character