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Im not sure that Hangarback Walker is the way to go

Not only do you get the same 3000 attack and piercing battle damage as the original Ancient Gear Golem, but when it destroys a monster in battle, you can discard a Machine-type monster to attack again (up to twice per turn)

The set introduces 86 new cards to the game, including Mew ex, Celebi ex, Gyarados ex, Aerodactyl ex, and Pidgeot ex

Yes, it has a clear downside, but sometimes you need the extra mana to ramp out something disruptive like a Trinisphere, Chalice of the Void, or a Blood Moon ahead of schedule, and thats well worth risking the loss of your land