Defender deck, help!!!!

[Rogan]

So guys iv been trying to make a deck using {Vent Sentinel} and this is the as far as iv got, can anyone suggest some cards that might improve it, I'm working on a limited budget around £50 ($75) so no extreme costly lands

Lands

5 {Plains}
4 {Jungle Shrine}
5 {Forest}
6 {Mountain}
2 {Terramorphic Expanse}
2 {Evolving Wilds}

creatures

4 {Vent Sentinel}
4 {Tree of Redemption}
4 {Overgrown Battlement}
4 {Order of the Stars}
4 {Wall of Omens}
4 {Perimeter Captain}


Spells

4 {Flame Slash}
4 {Pacifism}
4 {Lightning Bolt}

[Mlerner12]

Blue and {Doorkeeper}, is good. Also, {Axebane Guardian} could be goods.

[Almosteric]

Blue and {Doorkeeper}, is good. Also, {Axebane Guardian} could be goods.

Adding blue seems smart to me. This also opens you up to things like  {Fog Bank} {Wall of Denial}