Dragon's Mark

Enchant player
Put X target counters on this, where X is the
amount of colors used to cast this
Only enchanted player can activate abilities
2 counters: create a 4/4 dragon with flying each
upkeep
3 counters: {t}{u}{b}{r}: do 5 damage to any target
4 counters: spells you casts cost {u}{u}{b}{b}{r}{r} instead
5 counters: pay {u}{u}{u}{u}{u}{b}{b}{b}{b}{b}{r}{r}{r}{r}{r}, you win the game