Sivitri, Dragon Master Aetherdrift Flash Domain — This spell

Flash Domain — This spell costs {1} less to cast for each basic land type among lands you control

you may sacrifice any number of nonland permanents

Flash At the beginning of your upkeep

Forestwalk (This creature can't be blocked as long as defending player controls a Forest

Sivitri, Dragon Master Aetherdrift Flash Domain — This spell+1: Until your next turn, creatures can't attack you or planeswalkers you control unless their controller pays 2 life for each of those creatures. 3: Search your library for a Dragon card, reveal it, put it into your hand, then shuffle. 7: Destroy all non Dragon creatures. Sivitri, Dragon Master can be your commander.