mtg omen cards TR&CI 173: Omens & Harmonize the player puts it onto the battlefield Omen of Fire | Alliances

If you have a combo, look for a time to execute it when the potential for interruption is low to nonexistent

Sneak Attack is second best in this category as the upgrades can be a bit more expensive, but its a joy to play and a fantastic stocking stuffer

Unlike Urzas effect, this means newly cast artifact creatures cant tap right away due to summoning sickness still, the mana generation adds up fast

There are worse 5-drops to play, so it might be worth running Ultimecia on the off chance you can pay the cost, but I dont think Id go out of my way to pick it in a draft

Oh, and beware of the Lady of the Lake

Being able to give your spirit creatures double strike without building up extra loyalty points seems quite aggressive as well