Ember Prime

Heat of combat - As long as it’s your turn, Ember Prime gets +X/+0, where X is the number of
non-token creatures your opponents control.

Inferno - {5}: Ember Prime deals damage equal to
its power to each creature controlled by target opponent. Activate only as a sorcery.

"This is Ember, destructive and deadly. Ember's presence on the battlefield is devastating. Mind the heat, Tenno." ~Lotus