Squash
Instant
This spell costs 
less to cast if you control a Giant.
Squash deals 6 damage to target creature or planeswalker.
The troll had recently crushed a human in much the same way. Sadly, he expired too quickly to appreciate the irony.
Illustrated by
Kaldheim#152CommonEnglishLegality
Rulings
Feb 5, 2021
If you control more than one Giant, Squash’s cost is reduced by only .
Feb 5, 2021
Once you announce that you’re casting Squash, no player may take other actions until the spell’s been paid for. Notably, players can’t try to change the cost by removing your Giants.