Bug with Radha, Heart of Keld and riot
If you cast Radha and it somehow has riot (Domri, Chaos Bringer / Rhythm of the Wild), as you are choosing to give it haste or put a +1/+1 counter on it, you can see the top card of your library. As the decision for riot is made as the creature is entering the battlefield, and not as an etb, you should not know what the top card is until after you make your decision. As you can see, in my screenshot, it can influence your decision, if you have a card like Garruk's Uprising, as giving Radha the counter will let you draw a card off the enchantment.
it won't drop land correctly either - doesn't work right completely bugged. I've never had riot come up.