Is Rock Hydra legal in Standard, Modern, and Commander?

Rock Hydra is legal in: Legacy, Vintage, Commander.

Rock Hydra

Q: What type of card is Rock Hydra?

Rock Hydra is a Creature — Hydra. Its oracle text reads: "Rock Hydra enters with X +1/+1 counters on it.For each 1 damage that would be dealt to Rock Hydra, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage.{R}: Prevent the next 1 damage that would be dealt to Rock Hydra this turn.{R}{R}{R}: Put a +1/+1 counter on Rock Hydra. Activate only during your upkeep."

Creature — Hydra

Rock Hydra enters with X +1/+1 counters on it.<br>For each 1 damage that would be dealt to Rock Hydra, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage.<br>: Prevent the next 1 damage that would be dealt to Rock Hydra this turn.<br>: Put a +1/+1 counter on Rock Hydra. Activate only during your upkeep.

Set Limited Edition Alpha

Rarity Rare

Artist Jeff A. Menges