Printings
Mythos of Nethroi
Card Information
Type: Instant
Mana Cost: 2
CMC: 3
Part of the Reserved List: No
Color Identity: 
Set: Ikoria: Lair of Behemoths (IKO)
Rarity: Rare
Collector Number: 97
Oracle Text
Destroy target nonland permanent if it's a creature or if {G}{W} was spent to cast this spell.
Format Legalities
Card Rulings
- April 17, 2020
Mythos of Nethroi can target any nonland permanent. Determine as the spell resolves whether the permanent is destroyed, either because it’s a creature at that time or because {G}{W} was spent to cast the spell.
Source: wotc - April 17, 2020
If an effect copies the Mythos spell, no mana was spent to cast the copy, so the copy won’t receive the bonus.
Source: wotc - April 17, 2020
If an effect allows you to cast a spell without paying its mana cost, you can’t choose to cast it and pay unless another rule or effect allows you to cast that spell for a cost. Similarly, you can’t waive a cost reduction unless that effect says you may.
Source: wotc - April 17, 2020
The ability checks what mana was actually spent to cast a spell. If an effect allows you to spend mana “as though it were mana” of any color or type, that allows you to spend mana you couldn’t otherwise spend, but it doesn’t change what mana you spent to cast the spell.
Source: wotc - April 17, 2020
The abilities of the Mythos check what colors of mana were spent to cast the spell. It’s not an alternative cost to cast the spell.
Source: wotc
Price History
To study a single card is to glimpse the heart of a spell - a frozen moment of ambition, artistry, and arcane intent. Within each glyph lies a spark: a story untold, a duel turned, a destiny altered. Treat it not as mere parchment, dear seeker, but as a shard of the Multiverse itself.