As long as you have more cards in hand than each opponent, Secretkeeper gets +2/+2 and has flying.

Whenever a land enters the battlefield, its controller creates a 1/1 green Snake creature token.

Search your library for up to three basic land cards, reveal them, and put them into your hand. Then shuffle your library.

Sekki, Seasons' Guide enters the battlefield with eight +1/+1 counters on it.
If damage would be dealt to Sekki, prevent that damage, remove that many +1/+1 counters from Sekki, and create that many 1/1 colorless Spirit creature tokens.
Sacrifice eight Spirits: Return Sekki from your graveyard to the battlefield.

Whenever Shape Stealer blocks or becomes blocked by a creature, change Shape Stealer's base power and toughness to that creature's power and toughness until end of turn.

Exchange control of two target lands.
Splice onto Arcane (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

Shinen of Fear's Chill can't block.
Channel — , Discard Shinen of Fear's Chill: Target creature can't block this turn.

Flying
Channel — , Discard Shinen of Flight's Wings: Target creature gains flying until end of turn.

Haste
Channel — , Discard Shinen of Fury's Fire: Target creature gains haste until end of turn.

All creatures able to block Shinen of Life's Roar do so.
Channel — , Discard Shinen of Life's Roar: All creatures able to block target creature this turn do so.

First strike
Channel — , Discard Shinen of Stars' Light: Target creature gains first strike until end of turn.

Sweep — Return any number of Swamps you control to their owner's hand. Target player discards a card for each Swamp returned this way.

At the beginning of your upkeep, return a black creature you control to its owner's hand.
: Regenerate Skull Collector.

Flying
Whenever you cast a Spirit or Arcane spell, you may gain control of target creature with that spell's converted mana cost until end of turn.

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)
At the beginning of your upkeep, if a player has more cards in hand than each other player, the player who has the most cards in hand gains control of Sokenzan Renegade.

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)
: Sokenzan Spellblade gets +X/+0 until end of turn, where X is the number of cards in your hand.

Flying
Soramaro, First to Dream's power and toughness are each equal to the number of cards in your hand.
, Return a land you control to its owner's hand: Draw a card.

: Target creature you control gains flying until end of turn.
: Prevent all combat damage that would be dealt to and dealt by target creature you control this turn.

Spiraling Embers deals damage to any target equal to the number of cards in your hand.

Create a 1/1 colorless Spirit creature token.
Splice onto Arcane (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)