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If a cost associated with a special action, such as a suspend cost or a morph cost, has an {X} or an X in it, the value of X is chosen by the player taking the special action immediately before they pay that cost.

A spell or ability that creates a token sets both its name and its subtype(s). If the spell or ability doesn’t specify the name of the token, its name is the same as its subtype(s) plus the word “Token.” Once a token is on the battlefield, changing its name doesn’t change its subtype(s), and vice versa.

If an effect instructs a player to create a token that is a copy of a nonexistent object, no token is created (see rule 707, “Copying Objects”). This does not apply to an effect that would use the last known information of an object.

Some keyword abilities, such as equip and modular, represent targeted activated or triggered abilities, and some keyword abilities, such as mutate, cause spells to have targets. In those cases, the phrase “target [something]” appears in the rule for that keyword ability rather than in the ability itself. (The keyword’s reminder text will often contain the word “target.”) See rule 702, “Keyword Abilities.”

A player who has a card with suspend in their hand may exile that card. This is a special action. A player can take this action any time they have priority, but only if they could begin to cast that card by putting it onto the stack. See rule 702.62, “Suspend.”

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.

The active player chooses which creatures that they control, if any, will attack. The chosen creatures must be untapped, they can’t also be battles, and each one must either have haste or have been controlled by the active player continuously since the turn began.

A creature’s activated ability with the tap symbol ({T}) or the untap symbol ({Q}) in its activation cost can’t be activated unless the creature has been under its controller’s control since the start of their most recent turn. Ignore this rule for creatures with haste (see rule 702.10).

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.

You can target a creature with no abilities other than keywords with TL;DR, but when TL;DR resolves, it won’t exile that creature.

Yes, a keyword action is technically also a keyword, but it’s not possible for a creature to have a keyword action without having some other ability.

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!).