Is Meandering Towershell legal in Standard, Modern, and Commander?

Meandering Towershell is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Meandering Towershell

Q: What type of card is Meandering Towershell?

Meandering Towershell is a Creature — Turtle. Its oracle text reads: "Islandwalk (This creature can't be blocked as long as defending player controls an Island.) Whenever this creature attacks, exile it. Return it to the battlefield under your control tapped and attacking at the beginning of the declare attackers step on your next turn. Power/Toughness: 5/9"

Creature — Turtle

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Whenever this creature attacks, exile it. Return it to the battlefield under your control tapped and attacking at the beginning of the declare attackers step on your next turn.

Power/Toughness: 5/9

Set Khans of Tarkir

Rarity Rare

Mana Value 5

Artist YW Tang

Collector # 141

Scryfall