(They can't be blocked as long as defending player controls an Island.) Creature - Horror Squid Toothy, Imaginary Friend Partner with Pir, Imaginative Rascal (When this creature enters, target player may put Pir into their hand from their library, then shuffle.) Whenever you draw a card, put a +1/+1 counter on Toothy
You can also team up to kill an attacker with a bigger butt by multiple blocking
The bad news is that Mana Vault is only legal in Commander, where it's on the list of Game Changer cards, and it's restricted in Vintage
Boromir, Warden of the Tower You need to play Boromir, Warden of the Tower at sorcery speed, but you get some value, namely with that second ability
this happens without targeting said permanent, so you can put Pacifism on a creature with hexproof or shroud
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