Glacial Chasm [Ice Age] Avatar When Ancestral Knowledge leaves the

When Ancestral Knowledge leaves the battlefield

Discard down to your maximum hand size

considering that nature's portion

the controller of the permanent it becomes sacrifices it at the beginning of the next cleanup step

pay 4 life or put the card on top of your library

Glacial Chasm [Ice Age] Avatar When Ancestral Knowledge leaves theSet: Ice Age Type: Land Uncommon Cost: Cumulative upkeepPay 2 life. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) When Glacial Chasm enters the battlefield, sacrifice a land. Creatures you control can't attack. Prevent all damage that would be dealt to you.