The competitive deck that has abused the mechanic the most for years is "Zoodiac," who were the strongest deck in the game at one point and are now splashed into the "Tri-Brigade" deck to summon the most powerful Xyz monster in the metagame: "Divine Arsenal AA-Zeus - Sky Thunder." Synchro After Duel Monsters and GX went by, a new summoning mechanic was finally released with 5DS
It was intended as a one-off feature of Planar Chaos, to appear in that set and that set only
Bonecrusher sees extensive play in Pioneer in various Rakdos decks, as well as Gruul, Boros, and Mono-Red
Wrap Up Magus of the Moon | Illustration by Milivoj Ceran And with that, you now have a better understanding of causing chaos in your local EDH games
Each creature that convoked this spell connives
BE CAREFUL: if you summon Ra using something like Loading