You may exile a blue card with mana value X from your hand rather than pay this spell's mana cost
Silver can be obtained from Wisdom of Sea and Sky: Ho-Oh pack in the Wisdom of Sea and Sky set
Cruelclaw's Heist was first released in the set Bloomburrow, illustrated by Iris Compiet
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Den Protector is no different, and like some previous cards in the Top Five, also really dominated Standard when it as rocking the block
Opponents argue this would homogenize the format, with decks bleeding into each others strategies and breaking the creative challenge that comes from working within strict color limitations