Koga, Dragonstance form

Kicker: {u}{b} and/or {w}{g}
When Koga, Dragonstance form is transformed, if the white and green kicker was paid, it gains trample and lifelink
When Koga, Dragonstance form is tramsformed, if the blue and black kicker was paid, it can't be blocked and gains hexproof
If Koga, Dragonstance form would die, transform it instead
Sacrifice a creature: Transform Koga, Dragonstance form. Opponents can pay for this spell