mtg commander deck calculator Mana MTG Mana Curve Calculator :

Since theyre created tokens and not copies of another card, they have a mana value of 0 and can be removed immediately by cards like Ratchet Bomb

1 Old Stickfingers

If a creature you control being dealt damage causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time

If it costs 3, it has to have an overwhelming power (Liliana and Blood Moon)

The card they don't want you to draw is exiled with a counter and next turn you can -1 to draw the exiled card instead if you prefer, and that's good card flow over time and another colorless source of card draw

An 8/20 on its own would be bad enough, but this thing redirects all damage dealt to you or other permanents you control onto itself, effectively blocking the next 20 damage you take