pokemon card dialga & Palkia - Celebration Lot - Legendary Holo Foil Colorless Artist Wife pulls gold Dialga EX

Tinybones, Trinket Thief is a discard-themed mono-black commander

Contractual Safeguard promo foil $4 If you cast this in your main phase, you get 2W: put a shield counter on each creature you control

Court of Garenbrig Court of Garenbrig makes you the Monarch upon arrival

If you entwine Grab the Reins, steal an opponents Master and sacrifice another creature of yours, by the time damage is dealt Grab the Reins will already have Lifelink, and you will gain life

When you do, target creature you control gains your choice of flying, vigilance, deathtouch, or lifelink until end of turn

you could practically just pick a mechanic like landfall or constellation and have the basis of a fine theme deck