If Riptide Chimera is the only enchantment you control when its ability resolves, you must return it to its owner's hand.
26-04-2014
wotc
If you control no enchantments when Riptide Chimera's ability resolves (perhaps because Riptide Chimera stops being an enchantment for some reason), then nothing happens.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.