Just add a 1-mana modular card like Zabaz, the Glimmerwasp out of the command zone, or even something as mundane as Arcbound Worker, and youve got infinite triggers
Legality depends on the tournament format -- Will-o'-the-Wisp can be legal in some formats and banned or restricted in others
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It does not spike and crash with market trends the way some cards do
It was largely unpopular and soon scrapped, with the following cards banned across all formats: Amulet of Quoz Bronze Tablet Contract from Below Darkpact Demonic Attorney Jewelled Bird Rebirth Tempest Efreet Timmerian Fiends The MTG banlist also includes a number of cards that have been deemed racially or culturally insensitive
