[c]Savage Beating[/c] (Double Strike Red Instant) With [c]Savage Beating[/c]s first option you are effectively guaranteed to win this round of combat by giving all your creatures double strike
At the beginning of your upkeep, you may put a creature card exiled with Chaos Shrines Black Crystal onto the battlefield under your control with a finality counter on it
Its purpose is to keep the value of certain cards from dropping, but what its actually done is caused certain formats to be completely inaccessible to all but the most trust-fundy of people
Doran, Besieged by Time actually gives a +X/+X bonus, further increasing toughness and giving a power boost
Virtually every deck needs to play lands to get going, but if you drop an early Cemetery Gatekeeper and exile a land (which there should be abundance of in eternal formats), then is your opponent forced into not playing lands until they find an answer
Look up recent sales for the same card, paying attention to grading and edition, and compare them to yours to gauge its value