Is Merfolk Tunnel-Guide legal in Standard, Modern, and Commander?

Merfolk Tunnel-Guide is legal in: Historic.

Merfolk Tunnel-Guide

Q: What type of card is Merfolk Tunnel-Guide?

Merfolk Tunnel-Guide is a Creature — Merfolk Wizard. Its oracle text reads: "When Merfolk Tunnel-Guide enters, you get a three-time boon with "Whenever one or more Merfolk enter under your control, target Merfolk creature you control explores." Power/Toughness: 2/2"

Creature — Merfolk Wizard

When Merfolk Tunnel-Guide enters, you get a three-time boon with "Whenever one or more Merfolk enter under your control, target Merfolk creature you control explores."

Power/Toughness: 2/2

Set Alchemy: Ixalan

Rarity Uncommon

Mana Value 2

Artist Danny Schwartz

Collector # 25

Scryfall