Can you change the number of targets for a target spell?

If you choose new targets for the target spell, the new targets must be legal. If the target spell has a variable number of targets, you can’t change how many targets it has. If the target spell has damage divided as it was cast (like Mythos of Vadrok), the division can’t be changed although the targets receiving that damage still can.

Can you change the division of a spell?

2020-04-17: If the target spell has damage divided as it was cast (like Mythos of Vadrok), the division can’t be changed although the targets receiving that damage still can. The same is true of spells that distribute counters.

Can you change the target of an archmage attack?

Archmage attacks are little more than annoyances to Kalamax. If you choose new targets for the target spell, the new targets must be legal. If the target spell has a variable number of targets, you can’t change how many targets it has.

Can a Commander cast a counter target noncreature spell?

Counter target noncreature spell. If you control a commander, you may cast this spell without paying its mana cost. Creatures you control gain indestructible until end of turn. If you control a commander, you may cast this spell without paying its mana cost.

Is it illegal to leave targets unchanged in MTG?

114.6d If an effect allows a player to “choose new targets” for a spell or ability, the player may leave any number of the targets unchanged, even if those targets would be illegal. If the player chooses to change some or all of the targets, the new targets must be legal and must not cause any unchanged targets to become illegal.

What is a target in Magic The Gathering?

A target is a chosen recipient of the effects of a spell or ability. A spell can require you to target a creature, for instance. The text mentioning the target will usually say what sort of thing may be targeted. Specific rules apply when a spell has a target (s).