Budget Alternatives to Roil Elemental

Wave-Wing Elemental $0.05 5U · Elemental Flying Murasa Ranger $0.05 3G · Human Warrior Ranger Landfall — Whenever a land you control enters, you may pay {3}{G}. Calcite Snapper $0.09 1UU · Turtle Shroud Caustic Crawler $0.17 3BB · Insect Landfall — Whenever a land you control enters, you may have target creature get -1/-1 until end o... Tideforce Elemental $0.23 2U · Elemental {U}, {T}: You may tap or untap another target creature. Grazing Gladehart $0.27 2G · Antelope Landfall — Whenever a land you control enters, you may gain 2 life. Vault 87: Forced Evolution $0.29 3GU · Saga I — Gain control of target non-Mutant creature for as long as you control this Saga. Emeria Angel $0.30 2WW · Angel Flying Scrib Nibblers $0.31 2B · Rat {T}: Exile the top card of target player's library. Akoum Firebird $0.32 2RR · Phoenix Flying, haste Turntimber Basilisk $0.33 1GG · Basilisk Deathtouch Mind Flayer $0.39 3UU · Horror Dominate Monster — When this creature enters, gain control of target creature for as long as you ... Rubinia Soulsinger $0.43 2GWU · Faerie You may choose not to untap Rubinia Soulsinger during your untap step. Avenger of Zendikar $0.44 5GG · Elemental When this creature enters, create a 0/1 green Plant creature token for each land you control. Admonition Angel $1.14 3WWW · Angel Flying