Snapcaster Mage - Modern Masters 2017 (MM3)Flash When Snapcaster Mage enters the battlefield, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)

and head scratches

you may exile target non-Angel creature you control

untap it and all Samurai you control

players can't untap more than two permanents during their untap steps

then likely review the button prompts to your song

The most nimble of creatures

trample When Dragonlord Atarka enters the battlefield

Trample If you tap a permanent for mana

Instead their souls are drawn to great works of magic

vigilance Whenever Kazandu Blademaster or another Ally enters the battlefield under your control

where X is the number of Allies you control

"It has been my experience that disasters like to strike in pairs