Template:Teron Gorefiend strategy
Teron Gorefiend has a powerful, but difficult to use effect. He requires other minions in play, and often costs board advantage the turn he's summoned.
His first use can be similar to 
Carnivorous Cube, which allows him to cheaply activate Deathrattles and also summon your Deathrattle minions for a second use of their effect. This is very effective combined with Eggs, which gain their Deathrattles and return when Gorefiend is destroyed with attack value, making it easier for them to die a second time.
The secondary use for Teron Gorefiend is as a board buff. While this is a bit harder to make immediate use of, there are a few advantages over a standard +1/+1. You will get the 3/4 upfront, which is a fantastic statline for a card that gives your entire board a buff. It also essentially protects your board from area of effect attacks, forcing your opponent to deal with the 3/4 Gorefiend before they can clear the rest of your cards. Shamans can make particular use of this, filling their board with low threat Totems to combine with 
Splitting Axe and 
Totemic Reflection, then giving them all +1/+1.
You don't have to wait for a huge board to play Teron. Destroying even a simple 2/3 still gives you a 3/4 that summons a 3/4 on death, which is resilient and sticky, perfect for a token deck. Sometimes it may even be better to play Teron first, then play other minions afterwards to keep pressure on your opponent.
Teron Gorefiend is also quite effective with Deathrattle trigger and copy cards, like 
Shadowy Figure and 
Play Dead. This will resummon your entire board with +1/+1, and keep Gorefiend around for a second wave.
Beware of Silence and Transform effects, as these will render your entire board destroyed by Teron with no way to recover them. 
Shadow Madness can be even more devastating if the opponent has a way to kill off Teron after stealing him, as it will trigger his Deathrattle on their side.
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