While not a high-value investment, its a format-defining role-player that sees play in Pioneer, making it a great pickup for players on a budget
That's a lot of value for the mana cost
Two of its modes are two for ones and the steal ability has multiple relevant targets in Modern, so I would recommend playing this card in most decks which are able to pay for its restrictive mana cost
Whenever your opponent casts their first non-creature spell each turn, you may draw a card, unless your opponent pays X (where X is Esper Sentinel's power)
Now, Relentless Assault precedes Seize the Day by several years, but it's still so interesting to look at these two pretty simple effects that grant additional combat phases and then see how far that design space has come since the turn of the century
Karn, Legacy Reforged The MTG artifact creature that artifact creatures love best, Karn, Legacy Reforged is great whether you're going wide with lots of little artifacts and tokens or tall with a few massive ones