1 Ranging Raptors
You have to keep practicing until it becomes second nature and uses almost no cognitive space
As well as this, we can count on recent "nostalgia" sets like Tarkir: Dragonstorm having brought longtime players back into the fold to see fresh takes on old characters, game mechanics and settings
So, for the rest of the game, your first spell is a free effect or a free card, one or the other
A Lore Value of two and a hard-to-find rarity boost the value up even further, too
Also, there's Orochi Soul-Reaver , a 5/4 Snake Ninja Rogue that can be ninjutsued in for 4 instead of its normal 6 mana and provides a very good combat damage trigger for both commanders: Whenever one or more creatures you control deal combat damage to a player, you create a treasure token and manifest the top card of that player's library