If you apply Pokey's third ability as a replacement effect to rolling a d20, other than the original effect that called for the d20 roll, all other game effects, including replacement effects and triggered abilities, recognize that you flipped a coin rather than rolled a d20
And if Ojer finds itself in a tight spot and gets removed, it morphs into a land, keeping your strategies intact
Probably would need to test it so see, I suppose
Be aware that this test is less reliable for foil cards, which naturally block more light, and a few specific sets known for print variations
Yshtola Rhul Y'shtola Rhul offers one of the most unique abilities in Magic as the only card that provides an additional end step
Arcades became the ruler of Dominaria after the war thanks to Nicol Bolas leaving following his discovery of his spark and becoming a planeswalker