They simultaneously let you get the value of playing 41 cards in your draft deck with the increased consistency of running a 39-card deck
To double the number of +1/+1 counters on a creature, put a number of +1/+1 counters on it equal to the number it already has
Throne of the Grim Captain | Illustration by Tiffany Turrill Craft is a mechanic present on double-faced artifacts
If you are the kind of deck that wants to drip feed sacrifices over multiple turns with tap to sac outlets then this will be good but if you are going for the one shot kills this is far poorer
To retain its role as the "kill everything in one hit" card, Charizard also got its own Mega Evolution in Crimson Blaze that hits for 250 damage, enough to one-shot every Mega Evolution, again unless some precautions are taken
Effects like this usually require you to exile the creature you bring back, but Feldon allows you to target the same creature in your graveyard over and over