At the beginning of your upkeep, put a time counter on As Foretold. Once each turn, you may pay {0} rather than pay the mana cost for a spell you cast with mana value X or less, where X is the number of time counters on As Foretold.
"It is returning through the dark. And then, Doctor? Oh, but then he will knock four times."
Buyback {3} Choose a counter on target permanent or suspended card. Remove that counter from that permanent or card or put another of those counters on it.
Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.
"It's subtler than that. Any stronger and people would question it. But contained in that rhythm, in layers of code, Vote Saxon. Believe in me. Whispering to the world." —The Tenth Doctor
Destroy target creature or enchantment an opponent controls. You lose life equal to that permanent's mana value.
"All it took was a little Time. And all for this, to get beyond any one universe, to find Division, to get revenge on those who imprisoned us so long ago. To take them all."
The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.
"I am the Doctor. I'm coming to find you, and I will never, ever stop." —The Twelfth Doctor
At the beginning of each of your main phases, if you haven't added mana with this ability this turn, you may add X mana of any one color, where X is the number of Islands target opponent controls.
"Love is a form of hope and, like hope, love abides in the face of everything." —The Thirteenth Doctor
Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.
"Do you like the forest being in Trafalgar Square? I think it's lovely." —Maebh
You may play an additional land this turn. Draw a card.
"Somewhere there's danger, somewhere there's injustice, and somewhere else the tea's getting cold. Come on, Ace, we've got work to do!" —The Seventh Doctor
Draw a card. You may put a land card from your hand onto the battlefield.
"We're capable of the most incredible change. We can evolve while still staying true to who we are. We can honor who we've been and choose who we want to be next. —The Thirteenth Doctor