Originally Posted by
kaiadam
Reincarnate actually kills the minion, then resummons it. Activating the deathrattle is a side effect. All feign death does is activate the deathrattle. There are many mechanics that interact with death itself, not just deathrattle. Things that reincarnate does that feign death can't:
1.) Effectively heals the minion.
2.) Reenables charge attacks.
3.) Reapplies divine shield.
4.) Activates on-death effects like cult master, kel thuzad, and ancestral spirit.
5.) Activates on-summon effects like knife juggler.
6.) "Unsilences" a minion
7.) Activates deathrattles on opposing minions (eg. deathlord)
8.) Forces the minion to reposition on the very right side of the board.
9.) "Silences" a buffed (or debuffed) minion (eg. Twilight drake -> 4/1, Van Cleef -> 2/2, removes follow da rules, etc.)
Probably more but those are the effects I can recall off the top of my head.
Shaman have class cards that interact with nearly every additional feature. Ancestral spirit, flametongue totem, al'akir, etc.