It speaks volumes of how deep the color blue went in Invasion Block given that this card wasn't even in the top three blue cards of the format

Amaranthine Wall Avacyn's Memorial Barbed Servitor Bladed Battle-Fan Blightsteel Colossus Blitzwing, Adaptive Assailant Caduceus, Staff of Hermes Captain America's Shield Celebr-8000 Celestial Armor Colossus of Akros Creepy Doll Darkmoss Bridge Darksteel Axe Darksteel Brute Darksteel Citadel Darksteel Colossus Darksteel Forge Darksteel Gargoyle Darksteel Garrison Darksteel Ingot Darksteel Juggernaut Darksteel Monolith Darksteel Myr Darksteel Pendant Darksteel Plate Darksteel Reactor Darksteel Relic Darksteel Sentinel Diamond Pick-Axe Drossforge Bridge Eater of Virtue Eldrazi Monument Endurance Bobblehead Giggling Skitterspike Goldmire Bridge Hammer of Nazahn Hammer of Nazahn Iconic Shield Inspirit, Flagship Vessel Kaldra Compleat Krang, Utrom Warlord Lotus Ring Manhole Cover Manor Gargoyle Mistvault Bridge Mithril Coat Monument to Perfection Myr Matrix Necron Monolith Nutrient Block Paladin Danse, Steel Maverick Razortide Bridge Rustvale Bridge Salvation Colossus Shadowspear Shadowspear Shield of Kaldra Shuri's Fabricator Silverbluff Bridge Skyclave Relic Slagwoods Bridge Soul of New Phyrexia Sparkhunter Masticore Stolen Stark Tech Stuffy Doll Super-Adaptoid Tanglepool Bridge That Which Was Taken The Book of Vile Darkness The Fire Nation Drill The Mind Stone

2023-04-14 While you control City on Fire, if a creature you control with trample would deal combat damage to a blocking creature, you must assign its unmodified damage
Valakut, the Molten Pinnacle's triggered ability has an "intervening 'if' clause." That means (1) the ability won't trigger at all unless, at the time a Mountain enters under your control, you control five or more Mountains other than that new one, and (2) the ability will do nothing if you control fewer than five Mountains other than that new one by the time it resolves
Ghost jokes aside, this pairing has been pulling its weight, as it continues to climb from its starting point in the $90s, and has continued to skyrocket up past the $120 mark