The decks strategy is to use cards like Spiteful Visions and Kaervek the Merciless to chip away at your opponents life totals
While Im vehemently against being a catch-up color as being a worthy part of color pie design when it comes to Commander, there are worse ways to do it
Although Goyf will often be stronger than all these cards, there are still plenty of examples where these cards can pull Goyf's weight
Choose a commander you enjoy, define a clear strategy, add 7-10 win conditions, add the core components (draw, ramp, removal), build a 36-38 land mana base with color fixing, then playtest and tune the ratio
Mari, the Killing Quill is easy to cast, and with deathtouch, your opponents will be less likely to block your Assassins out of fear of losing their own important creatures
New players are flocking to Magic every day and, naturally, everyone always wants to get their hands on new cards