Oasis Ritualist | Creature | Naga Druid | {T}: Add one mana of any color.
{T}, Exert Oasis Ritualist: Add two mana of any one color. (An exerted creature won't untap during your next untap step.) | Josu Hernaiz
Ramunap Hydra | Creature | Snake Hydra | Vigilance, reach, trample
Ramunap Hydra gets +1/+1 as long as you control a Desert.
Ramunap Hydra gets +1/+1 as long as there is a Desert card in your graveyard. | Mike Burns
Tenacious Hunter | Creature | Crocodile | As long as a creature has a -1/-1 counter on it, Tenacious Hunter has vigilance and deathtouch. | Zezhou Chen
Samut, the Tested | Legendary Planeswalker | Samut | +1: Up to one target creature gains double strike until end of turn.
−2: Samut, the Tested deals 2 damage divided as you choose among one or two targets.
−7: Search your library for up to two creature and/or planeswalker cards, put them onto the battlefield, then shuffle. | Aleksi Briclot