Ron Lemen

Farewell to Arms

As Farewell to Arms comes into play, choose a hand attached to an opponent's arm.
When the chosen hand isn't behind its owner's back, sacrifice Farewell to Arms. If you do, that player discards his or her hand . . . of cards. (The lawyers wouldn't let us do it the other way.)

As this enchantment enters, choose a hand attached to an opponent's arm.
When the chosen hand isn't behind its owner's back, sacrifice this enchantment. If you do, that player discards their hand . . . of cards. (The lawyers wouldn't let us do it the other way.)

"We all come from somewhere. We carry that place with us wherever we go."

Saru, Unthreatened

Flash
When Saru enters, another target creature you control gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

Sylvia Tilly, Joy of Discovery

When Sylvia Tilly enters, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
At the beginning of combat on your turn, you may pay {1} and exile a card from your graveyard. When you do, put a +1/+1 counter on target creature.

Vault Guardsman

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
When this creature enters, exile target artifact or creature an opponent controls until this creature leaves the battlefield.

Captain America, Skybound

Flying, vigilance
Battalion — Whenever Captain America and at least two other creatures attack, put a +1/+1 counter on each attacking creature. They gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)