Is Xathrid Slyblade legal in Standard, Modern, and Commander?

Xathrid Slyblade is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Xathrid Slyblade

Q: What type of card is Xathrid Slyblade?

Xathrid Slyblade is a Creature — Human Assassin. Its oracle text reads: "Hexproof (This creature can't be the target of spells or abilities your opponents control.) {3}{B}: Until end of turn, this creature loses hexproof and gains first strike and deathtouch. (It deals combat damage before creatures without first strike. Any amount of damage it deals to a creature is enough to destroy it.)"

Creature — Human Assassin

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

: Until end of turn, this creature loses hexproof and gains first strike and deathtouch. (It deals combat damage before creatures without first strike. Any amount of damage it deals to a creature is enough to destroy it.)