what does x mean on mtg cards

what does x mean on mtg cards the value Magic: The Gathering's Decree of Justice card? just wondering about this card,

Name: what does x mean on mtg cards the value Magic: The Gathering's Decree of Justice card? just wondering about this card,
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Some of those cards are used in the infamous Simic Flash deck, which dominated Standard and maintains a powerful position in the current Historic meta

The cards striking art and nostalgic appeal make it desirable for collectors

It's also pivotal to future success - with Assassin's Creed and Final Fantasy on the way, nailing the right tone here goes a long way

Valgavoth, Terror Eater While flying and lifelink are good abilities on their own, Valgavoth, Terror Eater main threat is to steal resources from your opponents that get exiled instead of hitting the graveyard