Hi Hainer
here are some thoughts :
snapcaster + nightswhisper works only at your turn (captain obvious) and requires 4 mana
ur cc2 slot is to sick , and ur mana base is even for normal ritual tendrils pretty sick thin.
i would play
+ ponder
+ gifts
- vault /key
+ 2 islands (probably cut 1 mage even for land nr3 , mighte even be loa)
-2 NIghts whisper
lands/ ponder fix manabase , vault key not needed in ritual based tendrils.deck
(usually u wanna start the game with t1 whisper or confidant and not ponder , but ponder is simply betetr than nights whisper)
gifts land mox eot DR Gifts gg
first i considered 4 mages to much , but when u cut nights whispers , should work pretty fine , i know u love NW , but u actually try to play hyper fast combo gather with mages with cutting bargain and 3 rituals ^^
mfg
ps : are u really goin to play them ? ( and yes I AM BACK)