Jund Charm — ruling 1

You can choose a mode only if you can choose legal targets for that mode. If you can’t choose legal targets for any of the modes, you can’t cast the spell.

Jund Charm — ruling 2

While the spell is on the stack, treat it as though its only text is the chosen mode. The other two modes are treated as though they don’t exist. You don’t choose targets for those modes.

Jund Charm — ruling 3

If this spell is copied, the copy will have the same mode as the original.

Jund Charm : règles, fonctionnement et interactions (MTG)

Jund Charm is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Choose one — • Exile target player's graveyard. • Jund Charm deals 2 damage to each creature. • Put two +1/+1 counters on target creature.

How it works : Jund Charm

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2008· Wizards of the Coast
You can choose a mode only if you can choose legal targets for that mode. If you can’t choose legal targets for any of the modes, you can’t cast the spell.
No other card is named in this ruling.
#2October 1, 2008· Wizards of the Coast
While the spell is on the stack, treat it as though its only text is the chosen mode. The other two modes are treated as though they don’t exist. You don’t choose targets for those modes.
No other card is named in this ruling.
#3October 1, 2008· Wizards of the Coast
If this spell is copied, the copy will have the same mode as the original.
No other card is named in this ruling.