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Glare of Subdual will do the trick, and Opposition clearly has the most utility out of the three, but my sleeper pick would have to be for Diversionary Tactics - particularly the foil treatment

While this is already a handy use of two mana, whenever a dragon enters the battlefield under its owner's control, that player can deal X damage to any target where X is the number of dragons they control

A control deck which reliably draws three cards a turn and runs 45 Lands can probably skip ramp altogether in favor of more interaction

While a character is awake, they are safe from being challenged unless a card specifically states otherwise

This is of Super Rare rarity