Agatha, the Sixth Palm

Haste, doublestrike, menace
Shamancraft— Whenever you cast or discard
an instant or sorcery, put a ignite counter on
Agatha, the Sixth Palm.
Whenever six or more counters are put on
Agatha, or at the beginning of the end of the
turn, remove all the ignite counters and
deal X damage to target creature or planeswalker
where X is the counters removed