Mahoraga, Tenth Shadow

As an additional cost to cast this spell, sacrifice a treasure token
Trample
Whenever Mahoraga is dealt damage from a coloured source, Mahoraga gains protection from that colour. If Mahoraga would gain protection from two or more colours, Mahoraga instead gains protection from one of those colours of your choice.
If Mahoraga would be blocked by two or more creatures, Mahoraga loses protection from all colours.