Advice on my UR Delver List

Been playing this paper Delver list for over a year now, just casually with some friends, looking for advice on replacements, preferably not too huge with changes though.

List:

CREATURES

4 Delver of Secrets

4 Gurmag Angler

2 Sultai Scavenger

SPELLS

3 Agony Warp

4 Brainstorm

2 Condescend

4 Counterspell

1 Doom Blade

4 Ghastly Demise

2 Mana Leak

4 Mental Note

2 Ponder

2 Think Twice

4 Thought Scour

LANDS

4 Dismal Backwater

4 Evolving Wilds

8 Island

2 Swamp

SIDEBOARD

4 Duress

3 Chainer's Edict

3 Stormbound Geist

1 Shrivel

2 Essence Scatter

2 Dispel