mtg booster box foundations Magic: The Gathering Play or future Magic player Amazon.com: Magic: The Gathering Foundations

They're expensive, definitely the chase cards, and live up to the Mega Ultra Rare name

Maiden with Eyes of Blue is especially a damn good card to use with it because it punishes your opponent for daring to attack it by not only negating the attack, but also summoning Blue-Eyes White Dragon so your opponent ends up with a 3000ATK monster to deal with

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Thus, having this card out allows you to recycle them just by paying the cost

Play it alongside some +1/+1 counter synergy like Innkeeper's Talent or Hardened Scales to maximize its value