Is Magma Sliver legal in Standard, Modern, and Commander?

Magma Sliver is legal in: Legacy, Vintage, Commander.

Magma Sliver

Q: What type of card is Magma Sliver?

Magma Sliver is a Creature — Sliver. Its oracle text reads: "All Slivers have "{T}: Target Sliver creature gets +X/+0 until end of turn, where X is the number of Slivers on the battlefield." *As malleable as molten steel, but as dangerous as the finished blade.* Power/Toughness: 3/3"