Lutri, Pauper Otter

If more than one player wishes to reveal a companion, the starting player does so first, and players proceed in turn order. Once a player has chosen not to reveal a companion, that player can’t change their mind.

The companion ability has no effect if the card isn’t revealed as your companion at the start of the game, and it creates no restrictions on putting a card with a companion ability into your starting deck. For example, Lutri, Pauper Otter may be in your starting deck even if your starting deck contains cards with silver, gold, orange, and/or purple expansion symbols.

The companion’s other abilities apply only if the creature is on the battlefield. They have no effect while the companion is outside the game.

You may have one companion in the Commander variant. Your deck, including your commander, must meet its companion requirement. Your companion is not one of your 100 cards.

If you reveal a companion outside the game, for as long as it remains there, you may pay {3} any time you could cast a sorcery (that is, you have priority during your main phase and the stack is empty). Once you do, you put it into your hand and it behaves like any other card you’ve brought into the game. For example, if it’s discarded, countered, or destroyed, put it into your graveyard.

For many playtest cards, you’ll need to make a generous assumption that basic game rules would be updated to allow them to work. The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure.

Lutri, Pauper Otter’s companion restriction cares about the color of a card’s expansion symbol, not its rarity. If a card has no expansion symbol printed on it, it doesn’t violate Lutri’s companion restriction even if its rarity isn’t common.

The requirements of the companion ability apply only to your starting deck. They do not apply to your sideboard, nor to any cards added to your deck after the game began (such as with the conjure mechanic).

Before shuffling your deck to become your library, you may reveal one card from outside the game to be your companion if your starting deck meets the requirements of the companion ability. You can’t reveal more than one. It remains revealed outside the game as the game begins.

Playtest cards use a modified version of game symbols, such as {T} and {W}. These modified symbols should be treated as the standard symbols during play.