Rafiki isnt all about fighting, with the option to quest for a single lore if theres nothing left to challenge, but his lighting-fast attack speed and solid potential as a challenger makes him indispensable as a way to find a window in your opponents defences and hit them before they get a moment to react
Even outside dedicated poison decks, that ultimate sets an opponent up for death with any proliferate follow-up
Step right up and copy your Mindslaver, The Chain Veil or Thran Temporal Gateway triggers for the low low price of one mana and tapping a creature
Regardless, those were all the Magic cards I had left at the time, my mono red deck that brought me endless wins, after selling the rest earlier to friends
The curve is high, so some extra ramp would help, but overall the synergy is tight