There are a lot of cool ways of putting out loads of Dragons at once in Commander, and if they all come in at the same time, you can quite easily end up dealing eight damage eight times, which is more than enough to end most fights
In Two-Headed Giant , as long as either player from the defending team controls at least one land with/out the relevant subtype/supertype, the whole team may not assign blockers for an attacking creature with Landwalk
Deadeye Navigator Though Deadeye Navigator enjoyed a brief stint in Standard with Bant Pod, its more famous or perhaps more infamous for Commander combo potential
The reviews arent the most reliable
Quagmire Druid (2B): The oldest one of the four is from Apocalypse
You can earn plenty of cards from the most recent sets like Murders at Karlov Manor and Outlaws of Thunder Junction, just through play