Getting to "ping" for 6 and 5, or even just one of those is pretty significant, it will one shot a walker or a big threat or make a big dent to a life total
Rakdos can also somehow double up as a secret mill win condition too, cutting huge chunks out of an opponent's library any time you sacrifice a creature
You must target and destroy one of your own attacking creatures
Anathemancer can be very strong in the right Commander shell, because so many players use lots of nonbasic Lands
They look special, but the real value in old cards sits in the 1999 Base Set holos, not the gold promos
Any deck that can consistently generate counters, be they +1/+1 or keyword counters, can benefit greatly from running Tayam at the helm, particularly if that deck also packs graveyard synergies that the self-mill effect effect can enable