These are normal-frame, foil versions of legendary creatures and planeswalkers in the set
Similarly to Blood Moon, which is not at its strongest in Modern right now, the time might just not be right for Esper Sentinel and maybe in a different Metagame he ends up at the Top of our list
Let me know in the comments or over on Draftsims Twitter
Madison Li 0.5%inclusion 5 decks 1.01K decks Optimus Prime, Hero 0.5%inclusion 5 decks 1.01K decks Jhoira, Weatherlight Captain 0.4%inclusion 4 decks 1.01K decks Grimgrin, Corpse-Born 0.4%inclusion 4 decks 1.01K decks Tidus, Yuna's Guardian 0.4%inclusion 4 decks 990 decks New Cards Shuri, Wakandan Inventor 9.3%inclusion 7%synergy 23 decks 247 decks Captain Kathryn Janeway 7.7%inclusion 8%synergy 1 decks 13 decks Karolina Dean, Runaway 7.1%inclusion 6%synergy 1 decks 14 decks Ultron, Artificial Malevolence 6.5%inclusion 5%synergy 17 decks 261 decks Scientist Supreme of A.I.M
If the card has any mandatory additional costs, you must pay those