Originally Posted by
Keyboard Champion
You will need Blood Tap, get used to it. The other 2 options just don't come near the benefit of having 2 death runes you can use on demand for 2 death syphons or 2 scourge strikes when a burst window pops up. You can use Runic Corruption for PVE though as it doesn't really make a difference unless you're tanking as blood, then you need Blood Tap for tanking so you have on demand death strikes and not rely on RNG.
Macro Blood Tap to the ghoul empower button, it's not like you will need to save either and not use them together if you can. Don't macro it to Death Coil, noobs do that and completely counter the purpose of BT and might as well just use RC cause it has the same effect.
The use of BT is simple. Mash the BT button when all your runes are on cd and you don't have RP for death coils either, otherwise don't touch it.