I would cut
Trail of Evidence and
Winged Boots, it's also probably my personal bias but I might even cut
Dimir Spybug. Now for my reasoning why:
For
trail of evidence you have 17 spells that can trigger it, which is a decent amount, but I feel the slot is better used building synergy elsewhere and you already have a good amount of cards that do fairly unconditional surveiling compared to this.
Winged Boots - most of the stuff you'd want to have flying seems to have flying, so I'm not seeing that much benefit there; that leaves the ward 4 which while nice is something your opponents can force themselves through. If you need either evasion or protection in this slot I'm sure there are better options (
whispersilk cloak is more expensive mana-wise but also does both parts better) but it may not be necessary either way.
Dimir Spybug can obviously grow very big and is obviously quite nasty when combined with any sort of repeatable surveil (
doom whisperer is nice but without some lifegain can't boost it forever) but otherwise there's a decent setup cost and as mentioned with the bias I just prefer cards that give me their value quickly.
Obviously I couldn't 100% immerse myself into the deck synergies so could've missed something, but couple of things came to mind in general; if you're playing with proxies, wouldn't
Urza, Lord High Artificer be pretty nice here potentially? Also some eldrazi scions would probably do a good job here as well. Cool stuff nonetheless!