Rafi, Retro Racer{3}{R}Legendary Creature — Dinosaur PilotWhen Rafi enters and at the beginning of the first upkeep in a game where it's your commander, there's mana burn and combat damage uses the stack for the rest of the game. (If you don't know what that means, ask somebody over 30.)
{R}, Sacrifice Rafi: Each player adds {R}{R}{R}. 3/3 Windy City Aven{2}{U}{U}Creature — Bird WarriorFlying
Ascend MagicCon: Chicago (If you attended MagicCon: Chicago and control ten or more permanents, you get the Windy City's blessing for the rest of the game.)
Whenever this creature attacks, if you have the Windy City's blessing, create a 1/1 blue Bird creature token with flying. 4/3 Need for Speed (Not the Odyssey One){3}{R}EnchantmentStart your engines!
As long as your speed is 1 or higher, creatures you control have haste. The same is true for speed 2 and higher and trample, speed 3 or higher and first strike, and speed 4 and higher and super haste. (You may put a creature with super haste from your hand onto the battlefield tapped and attacking during your declare attackers step. You may pay its mana cost any time during your next turn. At the beginning of that turn's end step, if you haven't paid its mana cost, you lose the game. Wait. 4 and higher?) Mana Max, Afterburner{3}{R}Legendary Creature — Human Survivor PilotAt the beginning of each player's end step, Mana Max deals damage to that player equal to the number of untapped lands they control.
Whenever a player loses one or more unspent mana, each of that player's opponents creates a Treasure token. 4/4 Draw Team Lines{2}{W}{W}SorceryTeam Cloudspire — Destroy all creatures with power 4 or greater.
Team Speed Demons — Return all creature cards with power 3 or less from your graveyard to the battlefield. The Good Time Sleuth{3}{W}{B}Legendary Creature — Human?When The Good Time Sleuth enters, exile the top card of your library and each nontoken creature you control in a face-down pile, shuffle that pile, then manifest those cards. Then create a Blood token for each face-down creature you control. Those creature gain "Sacrifice a Blood: Turn this creature face up." Secretly choose one of them. As that creature is turned face up, reveal the choice and it becomes a 5/5 black Demon. 3/3