Apostle's Blessing an amaising side board card for protection or even used as an offensive measure to get through defense

Here are some cards to consider:

Pendelhaven

Blighted Agent (Much better than Glistener Elf )

Berserk (this is more of a must-have)

Lotus Petal

generally i would take out some of your creatures (Glistener Elf , Phyrexian Crusader , Signal Pest ) and put in some more pump spells and mana acceleration. Also you want to make sure, that your creatures hit your opponent, that's why they need evasion imho.

I aggree about needing evation. Usually infect decks play fast small creatures and rely on pump and evation to quickly deliver fatal poison. I play Artful Dodge as well as Apostle's Blessing to ensure my guy makes it to the finish line. Check out how i poison Blue green infection there are probably way better cards to play in this deck but it was a standard deck not that long ago and i havnt switched anything out because its pretty damn good as is. In any case +1 for broke ass infect decks everywhere!