Paying a whopping 7 mana just to play and equip this card if it isn't in your opening hand feels like a hard ask for any Aggro deck, which is a hard bargain to sell
Shocker, Unshakable is a six cost, 5/5 Legendary Creature that, on entering play, deals two damage to a creature and two damage to that creature's controller, effectively casting Shock twice
Your opponent declares blockers Combat damage is dealt Main Phase 2 Play a land (if you haven't already) Cast creatures and other spells End Creatures heal Pass the turn Aside from this basic "what you can do in a turn," there are a few more technical phases to mention
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Even better are Magus of the Moon and Ruination which barely effect us but can cripple 2C+ decks
Non-foil source material cards are available in Play Boosters and Collector Boosters