Claim the Firstborn

Gain control of target creature with mana value 3 or less until end of turn. Untap that creature. It gains haste until end of turn.

Wayward Guide-Beast

Trample, haste
Whenever Wayward Guide-Beast deals combat damage to a player, return a land you control to its owner's hand.

When Goblin Arsonist dies, you may have it deal 1 damage to any target.

Spikefield Cave enters tapped.
{T}: Add {R}.

Spikefield Hazard deals 1 damage to any target. If a permanent dealt damage this way would die this turn, exile it instead.

Landfall — Whenever a land you control enters, Akoum Hellhound gets +2/+2 until end of turn.

Frost Bite deals 2 damage to target creature or planeswalker. If you control three or more snow permanents, it deals 3 damage instead.

Target creature gets +3/+2 until end of turn.

As an additional cost to cast this spell, sacrifice a creature.
Draw two cards.

Lifelink
Whenever an enchanted creature dies, draw a card for each Aura you controlled that was attached to it.

Enchant creature
Enchanted creature gets -2/-2.

When Serrated Scorpion dies, it deals 2 damage to each opponent and you gain 2 life.