Tamaki, the Princely Type

Charm (This creature deals damage to creatures,
planeswalkers and players in the form of charm
counters.)
Join forces —Whenever Tamaki attacks or
blocks, each player starting with you may pay
any amount of mana. Target creature of each
player's choice gets +X/+0 until end of turn,
where X is the total amount of mana paid
this way.