"Flubber®" enters the battlefield with five +1/+1 counters on it.
Whenever "Flubber®" or another creature with a +1/+1 counter on it dies, put a +1/+1 counter on each creature with a +1/+1 counter on it.
Partner (You can have two commanders if both have partner.)

[+1]: Put a +1/+1 counter on up to one target creature. It gains indestructible until end of turn.
[−2]: Whenever one or more nontoken creatures attack this turn, create that many 1/1 white Soldier creature tokens that are tapped and attacking.
[−6]: You get an emblem with "At the beginning of combat on your turn, create a 1/1 white Soldier creature token, then put a +1/+1 counter on each creature you control."

Reach
When Cavalier of Thorns enters the battlefield, reveal the top five cards of your library. Put a land card from among them onto the battlefield and the rest into your graveyard.
When Cavalier of Thorns dies, you may exile it. If you do, put another target card from your graveyard on top of your library.

Counter target creature spell.
Draw a card.

: Add . When you spend this mana to cast a spell with converted mana cost 6 or greater, draw a card.
Partner (You can have two commanders if both have partner.)

When Goblin Engineer enters the battlefield, you may search your library for an artifact card, put it into your graveyard, then shuffle your library.
, , Sacrifice an artifact: Return target artifact card with converted mana cost 3 or less from your graveyard to the battlefield.

Helica Glider enters the battlefield with your choice of a flying counter or a first strike counter on it.

When Homarid Explorer enters the battlefield, target player mills four cards.

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)
Flash
Flying
When you cast this spell, draw a card.

When Invading Manticore enters the battlefield, amass 2. (Put two +1/+1 counters on an Army you control. If you don't control one, create a 0/0 black Zombie Army creature token first.)

Flying
, Discard a creature card: Return Kraul Swarm from your graveyard to your hand.

Reach (This creature can block creatures with flying.)

When Nantuko Cultivator enters the battlefield, you may discard any number of land cards. Put that many +1/+1 counters on Nantuko Cultivator and draw that many cards.

Flying
Landfall — Whenever a land enters the battlefield under your control, create a 0/2 red Dragon Egg creature token with defender and "When this creature dies, create a 2/2 red Dragon creature token with flying and ': This creature gets +1/+0 until end of turn.'"

Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)
Draw a card.

Defender
: Adapt 3. (If this creature has no +1/+1 counters on it, put three +1/+1 counters on it.)
As long as Scuttlegator has a +1/+1 counter on it, it can attack as though it didn't have defender.

: Adapt 1. (If this creature has no +1/+1 counters on it, put a +1/+1 counter on it.)
Whenever one or more +1/+1 counters are put on Sharktocrab, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

Slurrk, All-Ingesting enters the battlefield with five +1/+1 counters on it.
Whenever Slurrk or another creature you control dies, if it had a +1/+1 counter on it, put a +1/+1 counter on each creature you control that has a +1/+1 counter on it.
Partner (You can have two commanders if both have partner.)

, Sacrifice Smelt-Ward Ignus: Gain control of target creature with power 3 or less until end of turn. Untap that creature. It gains haste until end of turn. Activate this ability only any time you could cast a sorcery.

Flash
Cascade
Reach
When Sweet-Gum Recluse enters the battlefield, put three +1/+1 counters on each of any number of target creatures that entered the battlefield this turn.