Unlike golf, where mulligans are an informal agreement made and not allowed in sanctioned play, mulligans are baked into Magic and are available right up to the highest echelons of professional, competitive play
In addition to Kobold Overlord (which I included after the break), we've got Kobold Drill Sergeant and Kobold Taskmaster , all of which buff the kobolds with frankly rather minimal stats and effects for the card investment that they're asking
Is it the best or most competitive storm deck
Focus on corrupting each opponent first, get some extra cards from your commander, and then decide how youre going to achieve a poison kill
If its neither day nor night, it becomes day as Vadrik, Astral Archmage enters the battlefield less to cast, where X is Vadriks power.Whenever day becomes night or night becomes day, put a +1/+1 counter on Vadrik