Is Consul's Shieldguard legal in Standard, Modern, and Commander?

Consul's Shieldguard is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

What type of card is Consul's Shieldguard?

Consul's Shieldguard is a Creature — Dwarf Soldier. Its oracle text reads: "When this creature enters, you get {E}{E} (two energy counters). Whenever this creature attacks, you may pay {E}. If you do, another target attacking creature gains indestructible until end of turn."