Jötun Grunt — ruling 1

When paying Jötun Grunt’s cumulative upkeep, you may choose a different graveyard for each age counter. For example, if it has three age counters on it, you may put four cards from your graveyard on the bottom of your library and two cards from your opponent’s graveyard on the bottom of their library. However, you can’t put five cards from your graveyard on the bottom of your library and one card from your opponent’s graveyard on the bottom of their library.

Jötun Grunt : règles, fonctionnement et interactions (MTG)

Jötun Grunt 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

Cumulative upkeep—Put two cards from a single graveyard on the bottom of their owner's library. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

How it works : Jötun Grunt

Original English text — Wizards of the Coast / Scryfall

#1July 15, 2006· Wizards of the Coast
When paying Jötun Grunt’s cumulative upkeep, you may choose a different graveyard for each age counter. For example, if it has three age counters on it, you may put four cards from your graveyard on the bottom of your library and two cards from your opponent’s graveyard on the bottom of their library. However, you can’t put five cards from your graveyard on the bottom of your library and one card from your opponent’s graveyard on the bottom of their library.
No other card is named in this ruling.