Lets start with the simpler of the two, action cards
9 Hidetsugu's Second Rite Instant Win Spell 4 Mana Cost in Red Instant Hidetsugu's Second Rite has the potential to be an instant win condition
Zimone, Paradox Sculptor doubles any kind of counter, among creatures and artifacts you control
You have no maximum hand size
This cards currently about $3.00 , but it deserves to go lower
Other takes on this strategy have centered on Brain in a Jar, which has the disadvantage that it can be slow to get going late, but its advantage, in addition to not being an enchantment, is that it has an interesting combination with Days Undoing that allows you to cast Days Undoing on your opponents turn, skipping the end the turn clause, which means that the Days Undoing ends up in your graveyard