Taniwhas problem is its phasing ability, which causes it to phase out every other turn
If you are somehow generating one toughness tokens then it is incredibly efficient but even when your not it still offers great value and a variety of applications above and beyond pure card advantage
You gain 2 life for each creature you control and that player gains 2 life for each creature they control
Ratadrabik + Boromir Cards : Ratadrabik of Urborg + Boromir, Warden of the Tower Prerequisites: You control Ratadrabik of Urborg and Boromir, Warden of the Tower Result : Infinite sacrifice triggers, death triggers, creature ETBs and LTBs
In this case I went with a combination of the cards that anyone in his right mind would consider the best (Blightning, Lightning Bolt), and pushed the design in their direction Supplementing the deck list with speed, card drawing and cantrips to hit my land drops, and the full four Cruel Ultimatums
If the target creature is an illegal target as Deadly Embrace tries to resolve, it won't resolve and none of its effects will happen