what does x mean on mtg cards

what does x mean on mtg cards the symbol a Magic the Gathering card? just wondering about this card,

Name: what does x mean on mtg cards the symbol a Magic the Gathering card? just wondering about this card,
Brand: neuraldrones.de
SKU: 50112983153
Price: 21.65 USD
Availability: InStock
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SKU: 50112983153

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Description

its basically your Overrun

It allows you to turn any non-Ooze creature into a vanilla X/X creature based on the sacrificed creature's power

Both parts of this card are cheap enough that you could easily do both later in the game, making for an eventful combat step that turn

Veil of Summer Veil of Summer is a situational card as you and other permanents you control only gain hexproof from specific colors until the end of the turn

Creature Artifact - Horror Phyrexian Color tag templates(None) Plague Spitter At the beginning of your upkeep, this creature deals 1 damage to each creature and each player