Thwegar, merfolk warleader

Haste, vigilance, ward {x}, X is half Thwegar,
merfolk warleader's power
You may only cast Thwegar during your
precombat main phase. For each merfolk you
control you may have this spell cost {1} less to cast,
when you do that creature attacks this turn if able.
Whenever another merfolk you control dies, put
a +1/+1 counter on Thwegar, merfolk warleader.