Is Conduit of Ruin legal in Standard, Modern, and Commander?

Conduit of Ruin is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Conduit of Ruin

Q: What type of card is Conduit of Ruin?

Conduit of Ruin is a Creature — Eldrazi. Its oracle text reads: "When you cast this spell, you may search your library for a colorless creature card with mana value 7 or greater, reveal it, then shuffle and put that card on top. The first creature spell you cast each turn costs {2} less to cast."

Creature — Eldrazi

When you cast this spell, you may search your library for a colorless creature card with mana value 7 or greater, reveal it, then shuffle and put that card on top.

The first creature spell you cast each turn costs less to cast.