Kalain, Reclusive Painter This is a tough category to narrow to one, but Kalain is the pick here because of the new archetype she helped fuel: red-black treasure
As a one-and-done effect, this is totally fine, but you can get extra value by recurring Muralists with Rivaz of the Claw or Bladewing the Risen
No one wants a two mana mana dork, and no one should play Standard without Naturalize
WotC deliberately makes it hard to protect your Ninjas from removal and blockers, so the least we can do is maximize our snowball potential when the risks do pay off
Other than that, Two-headed Hellkite is a straightforward value engine to keep the hand stocked and attack evasively in the air
We hope this list would have ignited that fire in you, which will get you into collecting Pokemon cards because who knows, you might pull a card that can be worth thousands of dollars