Hans, Bardic Wanderer

+2: Put a Shield Counter on any number of target creatures you control, lose 2 life for each Counter placed this way beyond the first.
-2: Gain 3 life for each Shield Counter on permanents you control, then place a Shield Counter on Hans, Bardic Wanderer if you gained life this way.
-7: Creatures with Shield Counters gain Trample and +X/+X where X is the greatest power among permanents you control until end of turn.