Whenever a creature with myriad attacks a player, you get token copies tapped and attacking the other players in your pod , allowing one creature to pressure all three of your opponents in your typical Commander game
Legality depends on the tournament format -- Enduring Ideal can be legal in some formats and banned or restricted in others
Add just a little recursion like Crucible of Worlds, Icetill Explorer, even an Echoing Deeps and this can establish lots of land-based combos
Gen 5 Secret Rare Shiny cards are amazing too, but I can fully admit they didn't always pick the best-looking Shiny mons
Outlast only as a sorcery.) Modified creatures you control have lifelink
Instead of spells resolving in complete batches, players could now interact on the stack at any point, interrupts were removed from the game, combat damage used the stack, and the rules deactivating tapped artifacts and preventing tapped blockers from dealing damage were removed