Daemogoth Titan Its not every day that we see an 11/10 creature for 4 mana, like Daemogoth Titan
This is not just about making a fun cube or even about just making good decks that won't screw you very often
Or, you can get aggressive and producing a powerful individual threat like [card]Butcher of the Horde[/card]
Talrand, Sky Summoner Youd think Talrand, Sky Summoner is the best mono-blue commander with how often Wizards reprints it
Oh, unless you have a Voltaic Key or one of another dozen cards that can untap things
If you already have a decent Modern collection and are looking to push some of your decks over the top, pick up your Horizon Canopies while they are on sale, but if you are just getting started in Modern, your limited Magic budget will be better spent on more important cards from Iconic Masters