Struggle for Skemfar — ruling 1

You can cast Struggle for Skemfar targeting only a creature you control.

Struggle for Skemfar — ruling 2

If you choose two target creatures and either target is an illegal target as Struggle for Skemfar tries to resolve, neither creature will deal or be dealt damage.

Struggle for Skemfar — ruling 3

If the creature you control is an illegal target as Struggle for Skemfar tries to resolve, you won’t put a +1/+1 counter on it. If that creature is a legal target but the other creature isn’t, you’ll still put the +1/+1 counter on the creature you control.

Struggle for Skemfar — ruling 4

Because exiling a card with foretell from your hand is a special action, you can do so any time you have priority during your turn, including in response to spells and abilities. Once you announce you’re taking the action, no other player can respond by trying to remove the card from your hand.

Struggle for Skemfar — ruling 5

Casting a foretold card from exile follows the timing rules for that card. If you foretell an instant card, you can cast it as soon as the next player’s turn. In most cases, if you foretell a card that isn’t an instant (or doesn’t have flash), you’ll have to wait until your next turn to cast it.

Struggle for Skemfar — ruling 6

If you’re casting a foretold card from exile for its foretell cost, you can’t choose to cast it for any other alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, those must be paid to cast the spell.

Struggle for Skemfar : règles, fonctionnement et interactions (MTG)

Struggle for Skemfar 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

Put a +1/+1 counter on target creature you control. Then that creature fights up to one target creature you don't control. (Each deals damage equal to its power to the other.) Foretell (During your turn, you may pay and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

How it works : Struggle for Skemfar

Original English text — Wizards of the Coast / Scryfall

#1February 5, 2021· Wizards of the Coast
You can cast Struggle for Skemfar targeting only a creature you control.
No other card is named in this ruling.
#2February 5, 2021· Wizards of the Coast
If you choose two target creatures and either target is an illegal target as Struggle for Skemfar tries to resolve, neither creature will deal or be dealt damage.
No other card is named in this ruling.
#3February 5, 2021· Wizards of the Coast
If the creature you control is an illegal target as Struggle for Skemfar tries to resolve, you won’t put a +1/+1 counter on it. If that creature is a legal target but the other creature isn’t, you’ll still put the +1/+1 counter on the creature you control.
No other card is named in this ruling.
#4February 5, 2021· Wizards of the Coast
Because exiling a card with foretell from your hand is a special action, you can do so any time you have priority during your turn, including in response to spells and abilities. Once you announce you’re taking the action, no other player can respond by trying to remove the card from your hand.
Card named in this ruling
Foretell
#5February 5, 2021· Wizards of the Coast
Casting a foretold card from exile follows the timing rules for that card. If you foretell an instant card, you can cast it as soon as the next player’s turn. In most cases, if you foretell a card that isn’t an instant (or doesn’t have flash), you’ll have to wait until your next turn to cast it.
Card named in this ruling
Foretell
#6February 5, 2021· Wizards of the Coast
If you’re casting a foretold card from exile for its foretell cost, you can’t choose to cast it for any other alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, those must be paid to cast the spell.
Card named in this ruling
Foretell