If the target of Killer is illegal as the spell tries to resolve, it won't deal damage to any creatures
The reveal of these new Magic cards has already inspired plenty of deck-teching from players interested in building decks around them, and an early standout is the face card of the Ghost of Tsushima set: Jin Sakai, Ghost of Tsushima
This clearly wants to be a creature dork matters, artifact matters, land matters or enchantment matters all of which are in the Bant colors anyway
The hybrid cost makes it flexible in Abzan mana bases, and it pairs well with proactive strategies that just need a reliable answer to clear the way for attackers or to protect a board advantage
But if I can make even $1.00 in profit off of it, Id consider it a win. Most specs turn out to be losers
Triggers are already great, and doubling up on your already powerful effects can be too much to handle for some opponents