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Damage dealt to a player by a source without infect causes that player to lose that much life.

Damage dealt to a player by a source with infect causes that source’s controller to give the player that many poison counters.

Damage dealt to a creature by a source with wither and/or infect causes that source’s controller to put that many -1/-1 counters on that creature.

Damage dealt to a creature by a source with neither wither nor infect causes that much damage to be marked on that creature.

A keyword counter on a permanent or on a card in a zone other than the battlefield causes that object to gain that keyword. The keywords that a keyword counter can be are flying, first strike, double strike, deathtouch, decayed, exalted, haste, hexproof, indestructible, lifelink, menace, reach, shadow, trample, and vigilance, as well as any variants of those keywords. See rule 613.1f.

Multiple instances of infect on the same object are redundant.

Damage dealt to a creature by a source with neither wither nor infect is marked on that creature (see rule 120.3). If the total damage marked on that creature is greater than or equal to its toughness, that creature has been dealt lethal damage and is destroyed as a state-based action (see rule 704). All damage marked on a creature is removed when it regenerates (see rule 701.19, “Regenerate”) and during the cleanup step (see rule 514.2).

Some abilities trigger “Whenever you expend N.” A player expends N if they pay a cost to cast a spell and the amount of mana that player spent this turn to cast spells prior to paying that cost was less than N and became at least N after paying that cost.

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.

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.

Playtest cards aren’t legal for play in any tournament format other than Mystery Booster Limited formats. On the other hand, we expect they will spice up a wide variety of non-tournament games (as long as everyone’s on the same page about using them!).

You can destroy the initiative designation with Naturalize 2. Doing so removes the initiative from the game, though this doesn’t affect any existing dungeons in the game. No player will have the initiative until another spell or ability causes a player to take the initiative once more.

You can destroy a dungeon with Naturalize 2. Doing so removes that dungeon from the game and removes its owner’s venture marker from the game. Nothing prevents its owner from venturing into that dungeon again if another spell or ability instructs them to, though they would have to start from the topmost room again. Note that each dungeon has a single owner; even if two players are venturing through two dungeons with the same name, each of them owns a separate dungeon card.

You can destroy a player’s city’s blessing designation with Naturalize 2. That player no longer has the city’s blessing. They can regain the city’s blessing if they control a permanent with ascend or resolve an instant/sorcery spell with ascend while controlling ten or more permanents.

If you destroy an emblem with Naturalize 2, put that emblem into its owner’s graveyard. Then it’ll immediately cease to exist except in the very rare instance that it’s an emblem card like Essence of Ajani.

You can destroy the monarch designation with Naturalize 2. This abolishes the monarchy from the game. There will no longer be a monarch until another spell or ability causes a player to become the monarch once more.

As of the release of Mystery Booster 2, the following gameplay trackers can be destroyed with Naturalize 2: The monarch, city’s blessing, dungeons, day, night, and the initiative.

You can destroy the day or night designation with Naturalize 2. Doing so removes those designations from the game. It will be neither day nor night until a player controls a permanent with daybound or nightbound, or a spell or ability says “it becomes day” or “it becomes night.”