Bad Synergy. When do you want to play this card? It won't draw you Corpsetaker and you don't want to draw Burnbristle or Tirion, before you drew your Corpsetaker. Bit might be good in Arena, where Card draw is essential.
Guaranteed Tirion on turn 8. Forget the Divine Shield Shenanigans. it's not gonna work for the same reasons that Hand Buff didn't work. it requires too much setup. Paladins will just play this with Tirion for consistency.
3 mana 2/2 draw a card is probably not good enough. But a 3 mana 2/2 draw a specific card seems playable, when the specific cards are staples in nearly every deck and you want them in your hand. 1-1.5 mana for the body, 1.5-2 mana for drawing Wickerflame or Tirion (or maybe another minion).
But obviously anti-synergy with Corpsetaker (which will not be played with this card).