This card is specifically good thanks to its ability to help fill your graveyard for the purposes of Delirium synergies like Dragon's Rage Channeler and Unholy Heat
Despite all that, its still pretty tough to pull off because most coin-flipping cards are a one-off, or at most once a turn
Nobody walks in with a deck they spent $800 on
The only time were particularly vulnerable is during the equip activation (and obviously, exile abilities like Swords to Plowshares or Path to Exile dont make us too happy)
Zinnia, Valley's Voice grants your creatures offspring for easy copies of creatures, and if you evoke a Solitude, the little 1/1 token of Solitude is not affected by its sacrifice part of the effect because the cost was not paid for that permanent
(20 - 4 = 16) In Commander (EDH), players start with 40 life instead of 20 life