Daxos, Champion of Heroes

Whenever a mono white creature you control attacks, it gets +1/+2 until end of turn. Untap it.
Whenever a mono white creature you control deals combat damage to an opponent, add {w}. Only spend this mana to cast mono white creature spells or activate abilities of mono white creatures or planeswalkers. You don't lose unspent white mana as steps and phases end this turn.
"Elspeth has done so much for me. This is the least I can do. "