Guiliad Dreadnought

Foretell {7}, Trample, Flying & Painborn (Each 1 life you pay while casting pays for {1}. It enters play with a -1/-1 counter for each 1 life paid)
Crew 7 (Tap a number of creatures you control with total power 7 or more: This Vehicle becomes
an artifact creature until end of turn)
When this enters the battlefield or attacks, it can
deal 2 damage to any target & you gain 2 life or
you may add {w}{b} to your mana pool.