Gauntlet of Power [Kaladesh Inventions]Set: Kaladesh Inventions Type: Artifact Rarity: Mythic Cost: {5} As Gauntlet of Power enters the battlefield, choose a color. Creatures of the chosen color get +1 +1. Whenever a basic land is tapped for mana of the chosen color, its controller adds an additional one mana of that color.

it gets -4/+4 until end of turn

Set: XY: Ancient Origins Type: Fire Rarity: Uncommon Retreat cost: Colorless

You don't lose the game for having 0 or less life

Set: EX: Team Magma vs Team Aqua Type: Fighting Rarity: Ultra Rare Retreat cost: Colorless

Numsgil did in Blog

Set: Alpha Edition Type: Instant Rarity: Uncommon Cost: {W} Exile target creature

Set: Promo Finish: Rainbow Foil Type: Hero Rarity: Promo Class: Ninja Draconic Life: 40 Intellect: 4 You may start the game with a Phoenix Flame in your graveyard

Darkness Rarity: Rare Retreat cost: Colorless

remove a +1/+1 counter from it and prevent that 1 damage

you may destroy Refraction Bolters

Set: EX: Delta Species Type: Water Rarity: Ultra Rare Retreat cost: Colorless

Set: EX: Hidden Legends Type: Grass Rarity: Holo Rare Retreat cost: 0