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Whenever you attack with a creature an opponent owns, you gain 2 life and that player loses 2 life

It gives the card a sort of stained glass look with fractals throughout the foiling process, making parts of the card pop

Black Widow, Double Agent Body Double Double Cleave Double Cross Double Deal Double Dip Double Down Double Header Double Jump Double Major Double Negative Double Play Double Stroke Double Take Double Trouble Double Vision Doublecast Holographic Double Liliana's Other Contract (double-faced)(playtest) Osgood, Operation Double Plant a Sapling (double-faced)(playtest) Redoubled Stormsinger See Double Spark Double Spark Double Stunt Double Work a Double

MTGOs foils suffer from the same supply-inflation that real foils did when Collector Boosters and Set Boosters were introduced