X spells and activated abilities of creatures or other spells that draw you more than one card are usually the most effective
Still, Yuriko feels a bit too powerful sometimes, so mono-black is an option if you need a more mid-level ninja build
The biggest knock against it, besides the price tag, is how quickly friendships end from the repeated dO yOu PaY tHe OnE? That is a very legitimate reason that some players choose to skip it, but if youre strictly looking at power level, Rhystic Study is hard to beat
But if you wanna throw in your Mana CryptMana Crypts and Mana VaultMana Vaults, be my guest
Underworld Breach at instant speed, anyone
This iteration of Chandra is focused on vehicles, able to create vehicles with her zero-cost ability and turn them into creatures for free in each combat, thanks to her passive ability