Looking for some random cards

I'm really looking to trade for what I can (especially the cheaper ones), but I'm open to purchasing if you have a bunch of these cards and a seller profile.

3x Buried Ruin
2x Chancellor of the Annex
4x Hero's Downfall
4x Inquisition of Kozilek
1x Leyline of Lifeforce
4x Serum Powder
4x Supression Field
4x Surgical Extraction
2x Urborg, Tomb of Yawgmoth
2x Thoughtseize
4x Serra's Sanctum
1x Runed Halo
2x Replenish
4x Mana Confluence
2x Idyllic Tutor
1x Helm of Obedience
1x Ensnaring Bridge
2x Enlightened Tutor
4x Blinkmoth Nexus