Generally speaking, yes
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Titania, Gaea Incarnate Color Indicator: Green Legendary Creature Elemental Avatar Vigilance, reach, trample, haste Titanias power and toughness are each equal to the number of lands you control
We recommend not going below 30, or risk not having the resources needed
I thought that his words were worth printing here in full: I caution judges and players alike against being swept up in the frenzy that seems to be going on about this
However, note that Lich won't kill you if it is bounced or something - the current Oracle is, "When Lich is put into a graveyard from the battlefield, you lose the game." But you'd still be a zero life, so you'd lose for that reason, unless you could find a way to gain some life at the same time
Most mobilize cards have a predetermined N, like N=1 or N=2, but a few cards have mobilize X