If the resulting spell would leave the stack for any reasonit resolves, it doesn't resolve because its targets are illegal, it's countered, and so onit's exiled instead
According to EDHREC, fewer than 5,000 EDH decks feature Riku as a Commander
We last saw this in a precon with Commander 2017 in the Ur-Dragon deck
Legendary Creature - Human Pirate Color tag templates(None) Mirror Entity Changeling (This card is every creature type.) : Until end of turn, creatures you control have base power and toughness X/X and gain all creature types
If a player had gone all-out, they would explain that they had drafted a Burning Vengeance deck
Strip Mine Strip Mine is just a strictly better Wasteland in that it has the same text with no restrictions