Any of these options are more than powerful enough to compete at an FNM or even the Grand Prix level, so the build you choose is mostly about which style you like the most and how much you're willing to spend
Your two strongest plays, late game, however, have to do with Hades and Belle
They're typically only helpful for intentionally stalling out battles to grind out more EXP/JP when you don't yet have access to a debilitating status effect move like Frog to cripple the last enemy
Bloodgift Demon is just an extra Phyrexian Arena, which is pretty great
And if you cant beat the decks that draw on its power, then you might as well join them
After these common and uncommon cards, the 9th card in a Set Booster pack is the head-turning slot, as WOTC puts it