If mana generated with Arena of Glory's last ability is spent on a noncreature spell that becomes a creature later in the turn, that creature won't have haste
I can only imagine the apologetic dialogue each turn, "Sorry, Spike, but Ursine Monstrosity chose to attack you this time
, Sacrifice this artifact: Creatures you control gain hexproof until end of turn and can't be blocked this turn
A Kilo deck thrives on counterintelligence by establishing an infinite tap-and-untap loop, you can proliferate counters until you hit a win condition
Creature - Treefolk Combo (CTRL to add secondary) Counter Counter (CTRL to add secondary) Drain Kambal, Profiteering Mayor Whenever one or more tokens your opponents control enter, for each of them, create a tapped token that's a copy of it