One point against it is that it improves G/W Devotion where it already excels (lategame inevitability, green mana symbols, clunky creatures)
Shock Brigade, the premier Mardu common, is in fact good, and I see these come around way too late
[But] there's no shortage of people buying expensive Magic cards even in this economic climate
Once on the battlefield, Varis triggers Venture upon a creature or planeswalker spell getting cast

Release date: 1993-10-01 Air Elemental Ancestral Recall Animate Artifact Animate Dead Animate Wall Ankh of Mishra Armageddon Aspect of Wolf Bad Moon Badlands Balance Basalt Monolith Bayou Benalish Hero Berserk Birds of Paradise Black Knight Black Lotus Black Vise Black Ward Blaze of Glory Blessing Blue Elemental Blast Blue Ward Bog Wraith Braingeyser Burrowing Camouflage Castle Celestial Prism Channel Chaos Orb Chaoslace Circle of Protection: Black Circle of Protection: Blue Circle of Protection: Green Circle of Protection: Red Circle of Protection: White Clockwork Beast Clone Cockatrice Consecrate Land Conservator Contract from Below Control Magic Conversion Copper Tablet Copy Artifact Counterspell Craw Wurm Creature Bond Crusade Crystal Rod Cursed Land Cyclopean Tomb Dark Ritual Darkpact Death Ward Deathgrip Deathlace Demonic Attorney Demonic Hordes Demonic Tutor Dingus Egg Disenchant Disintegrate Disrupting Scepter Dragon Whelp Drain Life Drain Power Drudge Skeletons Dwarven Demolition Team

Sorcery Clones (CTRL to add secondary) Copy Drivnod, Carnage Dominus If a creature dying causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time