Activating a Walking Ballista is nice because it represents an extra point of power and toughness and well as an additional point of damage that can be thrown around at the Constructs owners discretion, but four mana isnt a small amount
It's not a huge amount of value, but when you consider the fact that you have three opponents, plus anything you do, you can draw upwards of four cards and make four tokens by the time your turn comes back around
Soul Shatter is one you should check out, though
Officially licensed 8ft Table Playmat for Magic: The Gathering Universes Beyond x Fallout
Card advantage also helps you power up win conditions like Jace, Wielder of Mysteries, Sphinx's Tutelage, and Thassa's Oracle
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