BBD: Doubling Season Real-Time The Arena Phase is when

The Arena Phase is when the bloody games are held

if you've cast three or more instant and sorcery spells this turn

the Roman Emperor Hadrian Augustus witnessed the aftermath of war between his armies and the savage Picts

return target spell or permanent to its owner's hand

feeling as though it's turning inside out

BBD: Doubling Season Real-Time The Arena Phase is whenIf an effect would create one or more tokens under your control, it creates twice that many of those tokens instead. If an effect would put one or more counters on a permanent you control, it puts twice that many of those counters on that permanent instead.