[20] On each player's turn, following a set phase order, they draw a card, tap their lands and other permanents as necessary to gain mana to cast spells, engage their creatures in a single attack round against their opponent who may use their own creatures to block the attack, and then complete other actions with any remaining mana
Mentor is a nice touch
When Impetuous Devils attacks, up to one target creature defending player controls blocks it this combat if able
Motunui, Island Paradise can be a good option as it can provide more Ink to play your Princesses but it may end up slowing your strategy down too much
Other than companions, which had their own problems, and Grief, which can be cast for free, White Plume Adventurer is actually the highest mana value creature banned in Legacy