The process of converting a sheet layout into its respective color layers is known as raster image processing, or RIP for short
If your curve is low enough, you should be able to reliably get back quite a few cards if youve been filling your graveyard throughout the game with self-mill or other means
In your developing turns, the flash on it offers you an amazing level of flexibility, letting you waste your opponents mana by not letting them use removal on your turn, catching your opponent off-guard sometimes (especially if they dont realise youre on Mono-Blue), and letting you hold up countermagic whilst still threatening to develop your battlefield if you dont need to counter something
Battles on the other hand have a one-shot effect, and even assuming you are able to cast them transformed on the same turn, they typically present a threat that is more likely to be something most decks are equipped to deal with
Tribal Reanimator Commanders (Scion of the Ur-Dragon, Horde of Notions, Gisa and Geralf, Kaalia of the Vast, etc.) There are a LOT of commanders well suited to tribal reanimator strategies, but the 4 I have listed here exemplify what you should be looking for when narrowing down which legendary creature should be at the helm