A Good Day to Die
Enchantment
At the end of the declare blockers step, roll a six sided die. Creatures you control get +X/+X until end of turn, where X is the die roll.

Chaoticist's Tower
[Land] (M)
, roll a die onto Chaoticist's tower: If the die landed on Chaoticist's tower without knocking any dice off of it, stack it on top of all dice already on Chaoticist's tower, then add to your mana pool for each die in that stack. Otherwise, remove all dice from Chaoticist's tower.
Luck and skill are not so different, to the trained eye

Nth degree Elemental
Creature - Elemental
As ~ enters the battlefield, roll a die.
~ enters the battlefield with y^x +1/+1 counters on it, where y is the result of the die roll.
0/0

Wild Anthem

Enchantment
At the beginning of your upkeep, roll a die. Creatures you control get +X/+X and gain trample until end of turn, where X is the number you rolled. Each opponent gains life equal to the sides of the die you rolled.

Goblin Gatling Gun

Artifact
: Choose any number target creatures and roll six-sided dice, one at a time, until you roll any duplicates or choose to stop. If you chose to stop, Goblin Gatling Gun deals damage to the targets equal to the sum of all die rolls, divided as you choose. If you rolled a duplicate, Goblin Gatling Gun deals damage equal to the duplicate rolled to you instead. (for instance, if you roll 1-3-5-6, you will divide 15 damage among all targets. If you roll 1-3-5-3, you will be dealt 3 damage)