mtg cards with x Mana Cost: humanReadable.=[XR], 52 put a +1/+1 counter on that creature and a +1/+1 counter on X Would this card work with

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Forcing everyone at the table to pay an additional three generic mana for each card they cast is absolutely back breaking and is sure to delay everyone's turns by a significant amount

$0.59 Polluted Mire Urza's Saga $0.35 Drifting Meadow Urza's Saga $6.99 Privileged Position (Borderless) Double Masters 2022 Variants $0.49 Slith Predator Mirrodin $3.99 Land Grant Mercadian Masques $10.99 Noxious Revival New Phyrexia $0.35 Disciple of Law Urza's Saga $0.35 Slippery Karst Urza's Saga $0.39 Gilded Light Scourge $9.99 Force Bubble Scourge $0.35 Expunge Urza's Saga $0.79 Rapid Decay Urza's Destiny 0 results found

While White Knight might have built-in first strike and one more point of toughness, the pump Knights make up for this by having much more staying power in the mid to late game