Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Time Walk

Tap all lands target player controls and that player loses all unspent mana.

Whenever an opponent casts a creature spell, Soul Barrier deals 2 damage to that player unless they pay {2}.

Search your library for a blue instant card, reveal that card, put it into your hand, then shuffle.

Return target creature to its owner's hand.

{T}: Add {C}.
{T}, Sacrifice Strip Mine: Destroy target land.

Flying (This creature can't be blocked except by creatures with flying or reach.)

Discard X cards, then return a card from your graveyard to your hand for each card discarded this way. Exile Recall.

Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.

Return target permanent to its owner's hand.

Psionic Blast deals 4 damage to any target and 2 damage to you.

Enchant creature
You control enchanted creature.

Counter target spell. If that spell is countered this way, put it on top of its owner's library instead of into that player's graveyard.

{T}: Add {C}.
{T}: Draw a card. Activate only if you have exactly seven cards in hand.