Grim Tutor Is this what you were looking for
When it enters or attacks, it deals 3 damage to any target and you gain 3 life
Your primary threats are Field of the Dead for an undead horde and Dark Depths to go as tall as tokens can go
and the same cards that make Silas Renn strong can be used to clear a path through blockers for two different commanders, racking up damage and getting triggers from combat damage
6 Sol Ring If were being honest, Sol Ring is probably the best ramp card in Commander, but its just a bit boring compared to our other picks, so were putting our foot down a little bit in the name of variety
While there are lots of others you may want to run as your commander, if you want to run a bunch of cool dragons, Ur-Dragon is king