Kaden, Lord of Locus

Landfall - Whenever a land enters the battlefield under your control, add {r} if this is the first time this ability has resolved this turn.
If it's the second time add {g}{u}.
If it's the third add {b}{w}.
If it's the fourth time you may pay {w}{u}{b}{r}{g} rather than pay the mana costs
for spells you cast until end of turn.