That speed of accumulation is itself a data point worth noting: it demonstrates just how rapidly the modern grading pipeline operates compared to even five years ago
Due to its low mana cost, Esper Sentinel is generally more effective in constructed formats but still packs a punch when played early
For even more excitement, you can hide it in a scavenger hunt or attach it to a small item that matches the theme of the card (like a whisk for a cooking store gift card)
We should be getting enchant lands in every color that produce an extra mana and do something similar
Creepiness aside, he seems like a cool recursive attacker who will continue to harass your opponents using the Armour of Shrieking Souls as long as you can make sure that their creatures keep leaving the battlefield
At least the others have some kind of real use, but Amethyst Cat is a 1200 ATK monster that can attack directly, but it can only deal half battle damage when it does so