squee mtg cards Slimefoot and SAPROLING SACRIFICE Magic Commander Deck – CommanderComplete Whenever Slimefoot and Squee enters the battlefield or attacks Squee's Toy card from Magic:

Illustrated by Lucas Staniec Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Legal Modern Not Legal Brawl Legal Legacy Legal Comp

2014-09-20 Ferocious abilities of instants and sorceries that dont use the word instead will provide an additional effect if you control a creature with power 4 or greater as they resolve.

For example, you can't cast a creature card with mayhem you couldn't normally cast during an opponent's turn, even if you discard that card during an opponent's turn

If the worst parts of history can repeat themselves, it stands to reason that the best parts can as well. Teferi Illustrated by Titus Lunter Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp

For some other ones, see the list below

Yes on all counts, with one important note about intellectual property