Glyph of Warding
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Enemy minions cost (1) more.
See this card on Hearthpwn
Glyph of Warding is an uncollectible neutral spell card, from the Kobolds and Catacombs set. It can be drafted as part of a Dungeon Run, Monster Hunt, a Dalaran Heist, or a Tombs of Terror run as a treasure.
For more information, see Dungeon Run, Monster Hunt, The Dalaran Heist, or Tombs of Terror.
While at first glance this can seem tame, later on you'll find that you can disarm a LOT of very expensive minions like K'zrath, Plague Lord of Madness's C'Thun or other 10 Mana cards. Note that this does NOT affect spells, so be mindful about that.
Glyph of Warding, full art