The season ends on May 13 at 12 p.m
You don't have to worry about anything happening to you to recover your spent mana
Its hard looking at a card like Chulane and finding faults, but if you needed to nit-pick, you could criticise the mana cost for requiring three different colours, or the fact that it doesnt come with any ways to reduce mana costs for creatures you play
Liliana's Mastery: a little too heavy
Strangely enough, the people who benefit from this new change of tactics the most arent Commander players, but those who are sick of seeing Commander cards everywhere
5 mana is perfectly accessible for a casting cost, and with a way to move your permanents out of harms way or cast them from suspend or the graveyard, it has almost no equal when it comes to facilitating the end of the game