What made you choose her over blue gremlin?

 Ethereal attack and flight

Yes on both, Divine Protection says on the top for legal targets Living Creature,  so it is okay. And the Damage Barrier says corporeal creature so again they both work. Vigilant just means he/she is always guarding regardless of what action it takes.

I usually just cast it in my starting corner,  because I can cast creatures anywhere I have a vine. :/

It looks like you plan on going for a big creature play or a swarm imp play. I'm not sure how you're going to fit Sersriyx into this. Also what turn are you planning on getting Adramelech out? My opening for Adramelech is to turn 1 quick cast a mana crystal and double move. Turn 2 I cast Adramalech. It's a super committed play but I think Adramelech is no matter how you look at him.

I am open to suggestions. i have problems building i have limited play experience. against 2 people.

A revision to my previously posted book.

Equipment

1x Demonhide Armor
1x Lash of Hellfire
1x Bloodfire Helmet
1x Fireshaper Ring
1x Cloak of Shadows
1x Gauntlets of Strength
1x Leather Boots
1x Mage Wand

Conjurations

1x Pentagram

Creatures

1x Adramelech
1x Sersriyx, Imp Familliar
6x Wildfire Imp
2x Firebrand Imp
2x Infernian Scourger
2x Flaiming Hellion

Enchantments

1x Hawkeye
1x Circle of Fire
2x Decoy
1x Marked for Death
2x Mind Shield
1x poisoned Blood
2x Ghoul Rot
1x Rhino Hide
1x Enfeeble
1x Harmonize
2x Nullify
2x Hellfire Trap
3x Adramelech's Touch
2x Maim Wings
2x Rust

Incantations

2x Explode
1x Force Push
1x Knockdown
1x Dispel
1x Defend
4x Ignite
2x Seeking Dispel

Attack

2x Fireball
3x Flameblast
1x Ring of Fire

A revision to the previous deck idea.

Equipment

1x Moonglow Amulet
1x Deflection Bracers
1x Harshforge Plate
1x Ring of Command
1x Defense Ring
1x Veteran's Belt
1x Mage Wand
1x Eagleclaw Boots
1x Morning Star
1x Helm of Command
1x Elemental Cloak
1x Horn of Gothos

Enchantments

1x Regrowth
1x Bear Strength
2x Mind Shield
1x Armor Ward
1x Rhino Hide
1x Standard Bearer
4x Nullify
2x Decoy
1x Cheetah Speed
1x Healing Charm

Conjurations

1x Barracks
1x Garrison Post
1x Archer's Watchtower

Creatures

2x Bloodcrag Minotaur
1x Gurmash, Orc Sergeant
2x Dwarf Panzergarde
2x Orc Butcher
4x Goblin Grunt
2x Goblin Slinger
1x Thorg, Chief Bodyguard

Incantations

3x Power Strike
1x Seeking Dispel
1x Akiro's Battle Cry
1x Knockdown
1x Piercing Strike
1x Perfect Strike
1x Sniper Shot
1x Dissolve
1x Defend
1x Battle Fury
1x Charge
1x Flank Attack

 oh thanks i didn't even think about that one. hmm. maybe i should run some Holy magic just in case? well i have some tweaking to do to this before i can play against people...