The myr were designed to be disposable and have no qualms with disposing of themselves
In my opinion, most decks will perform better if they stick to 60 cards, because card draw becomes more reliable that way
How MTG's Companions Broke The Game As for companions, these are cards that players can keep outside of their decks and play when they have enough mana to do so, only after they spend an extra three mana of any color
While three mana is a lot for counter magic, having a solid NO can make a difference
Interestingly, part of ending a turn immediately involves exiling all spells and abilities from the stack, which means the effect ending the turn usually exiles itself
Some valuable cards include Royal Tantrum, Donald Duck - Pie Slinger and Clarabelle - Light On Her Hooves