Worldly Tutor

Search your library for a creature card, reveal it, then shuffle and put the card on top.

Force of Will

You may pay 1 life and exile a blue card from your hand rather than pay this spell's mana cost.
Counter target spell.

Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays {X}, where X is Esper Sentinel's power.

Exile target creature. Its controller gains life equal to its power.

Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.

Search your library for an instant or sorcery card, reveal it, then shuffle and put that card on top.

Search your library for a card, put that card into your hand, discard a card at random, then shuffle.

If you control a commander, you may cast this spell without paying its mana cost.
Counter target noncreature spell.

If you control a commander, you may cast this spell without paying its mana cost.
Exile target creature.

Undaunted (This spell costs {1} less to cast for each opponent.)
Destroy two target creatures.

Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.