the ring tempts you mtg card Is mechanic overpowered? Took Reaper · The Lord

One of the other problems that tinker has is that cube's traditionally don't have a high artifact count

attached to your leader, all of your characters will receive a point to their cost, making it a bit harder for decks like Rob Lucci to remove from the board

if you assume, on average, you're drafting 31 playables for your deck (23 spells, 5 lands, 3 sideboard cards) then approximately 10% of your cube could potentially be strong sideboard cards and the resulting decks would be 'more powerful' than a cube with no sideboard cards

Although it can't prevent combat damage that would be dealt to your planeswalkers, it can still prevent noncombat damage that your opponent would want to redirect from you to one of your planeswalkers