When Mystic Mackerel enters, you may have target player mill two cards. {3}{U}, Sacrifice Mystic Mackerel: Return target enchantment, instant, or sorcery card from your graveyard to your hand.
Stampede — Whenever Nacatl Skirmisher and a creature with greater power attack, creatures you control get +1/+0 until end of turn. {R}, Sacrifice Nacatl Skirmisher: Destroy target artifact.
Defender (This creature can't attack.) When Naturebound Druid enters, you may search your library for a basic land card, reveal it, then shuffle and put that card on top.
Whenever Netsight Trickster deals combat damage to an opponent, create a Function token with “Draw a card. Then discard a card unless you pay {2}.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)
Return target creature card from your graveyard to your hand. If that card is a Human, you gain 3 life. Flashback {3}{W}(You may cast this card from your graveyard for its flashback cost. Then exile it.)