(Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays 3 life.) Magecraft Whenever you cast or copy an instant or sorcery spell, create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life." Creature - Human Warlock Tokens (CTRL to add secondary) Tutor Beseech the Mirror Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.) Search your library for a card, exile it face down, then shuffle
Instead of the standard foil pattern, these cards feature a Master Ball symbol
This can be done at instant speed, allowing you to wait until you know you don't need to hold mana up for interaction anymore to get a new card into your hand
It does exactly what you want at the end of a game in that it comes down and encourages you to attack with all of your creatures after tapping out to play it
Alternatively, I could have used Lucene or Elastic search