Borrowed Knowledge — ruling 1

If the first mode of Borrowed Knowledge was chosen but the target is illegal when Borrowed Knowledge tries to resolve, it won't resolve and none of its effects will happen. You won't discard your hand or draw any cards.

Borrowed Knowledge : règles, fonctionnement et interactions (MTG)

Borrowed Knowledge 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 — • Discard your hand, then draw cards equal to the number of cards in target opponent's hand. • Discard your hand, then draw cards equal to the number of cards discarded this way.

How it works : Borrowed Knowledge

Original English text — Wizards of the Coast / Scryfall

#1March 20, 2026· Wizards of the Coast
If the first mode of Borrowed Knowledge was chosen but the target is illegal when Borrowed Knowledge tries to resolve, it won't resolve and none of its effects will happen. You won't discard your hand or draw any cards.
No other card is named in this ruling.