It's obnoxious as hell, but Collective Restraint is four mana! Also, Collapsing Borders is kinda funny
Borders is a neat idea, but it's not gunna work as an aggro card. Against a mono color deck it deals them 2 damage every turn. Against anybody else it's either not worth it, or nets them life. Unless you're trying to gain life from it?
oh my god, yes, add more sunburst! And then add ION STORM!!!!Yeah, that's why I called it obnoxious as hell Collapsing Borders is a fun build-around-me card though! You could also look into more sunburst cards. The cheaper ones are super funny with Fist of the Suns Pentad Prism is maybe worth doubling up on? Baton of Courage is a pretty decent combat trick, Clearwater Goblet is a powerful lifegain tool, Engineered Explosives we all know, Infused Arrows is decent enough, Opaline Bracers hits like a truck, Suntouched Myr is an early drop for the deck, and Skyreach Manta is a fat finisher. The beauty of sunburst is that it overlaps wonderfully with the proliferate subtheme as well