Chaos: Whenever you roll Chaos, each player draws X cards, where X is the number of creatures with Flying they control
An adventure card is a creature card in every zone except the stack, as well as while on the stack if not cast as an Adventure
Additionally, because many of MTG 's most iconic characters having been compleated, even deities like Heliod, God of the Sun, March of the Machine will feature highly thematic double-faced cards depicting both normal and completead versions
Whenever you cast a Dog spell, create a 1/1 green Cat creature token
Most importantly, Rivals of Ixalan, like Ixalan itself, doesn't contain Masterpieces, which means that rares and mythics need to be more expensive to help make up for the value lost by not having the ultra-rares in the set
Mother of Runes style effects are especially powerful here, as are copy effects like the combo-ready Kiki-Jiki, Mirror Breaker