If anything points to blue/white or Bant Merfolk in Lost Caverns of Ixalan , this does
To make them consistent, we run Aquitects Will and Tide Shaper that can shape lands into Islands
Rishkar, Peema Renegade Most +1/+1 counter commanders spread a bunch of counters across the team or double the counters you put on creatures
Wizards of the Coast has its own written stance on proxies, in which they state: Wizards of the Coast has no desire to police playtest cards made for personal, non-commercial use, even if that usage takes place in a store. What is the Point of a Proxy
Theres also the chaos effect to keep in mind, which blinks any target creature and returns it to play, giving you another chance to deal some extra damage to any target of your choice
Additionally, if your deck has a lot of card draw or even just manipulation (your Commander Scrys or draws, for example, or you're Mono-Blue with a ton of cantrips and Ponder-style effects), you can adjust your number