Seymour, Grand Maester

+1: Create a 3/3 Summon token with trample that's all colours.`
-3: Choose up to two target creatures. For each of them, put a number of +1/+1 counters on it equal to the number of colours it is.
-6: Return target multicolored card from your graveyard to hand. If that card was all colours, draw a card and create two Treasure tokens.