Phyrexian Beast

If you spend only Green Mana to cast this spell Phyrexian Beast is a 3/5 with, When
Phyrexian Beast attacks it gives all other attacking creatures +1/+1 and swampwalk.
If you only spend Black mana to cast this spell Phyrexian Beast is a 4/4 with Trample and,
When Phyrexian Beast attacks it gets -4/-3
if White is the most common color among
your opponents cards.