Cards like Thundermaw Hellkite are fantastic threats too, and great finishers, but they rarely do the whole job, they rely on other cards having done a lot of prior work
However, it's recommended to store trays separately to prevent potential damage to cards
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Sure, itll save your creature from several removal spells, keep it alive in combat, or ambush fliers, but it wont help it trade up in combat or get in the last several surprise points of damage
Undead Augur Undead Augurs in that same category as the 3-drop card advantage creatures, but its a 2-drop, and is actually relevant for a certain black devotion wincon
Its card draw rather than milling or discard, but that just makes it that much more of a fit for a wheels theme