Mystic Remora

Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays {4}.

Cumulative Upkeep: {1}
Whenever target opponent successfully casts a non-creature spell, you may draw a card. That player may pay {4} to counter this effect.

Avatar: The Last Airbender Eternal

Secret Lair Drop

Dominaria Remastered

The bond between spellcaster and familiar allows the mage to detect even the smallest of magical ripples—and use them to their advantage.

Masters Edition

Cumulative upkeep {1}
Whenever an opponent plays a noncreature spell, you may draw a card unless that player pays {4}.